Is this Sony XF90 the best midrange TV you
can buy in terms of picture quality this year?
Let's find out.
Hello everyone, Vincent Teoh from HDTVTest
here, I'm a TV reviewer and professional calibrator,
and this... is the Sony XF90 or XF9005, also
marketed as the Bravia X900F in the USA.
It uses full-array local dimming (or FALD) direct-lit
LED backlight technology which is widely acknowledged
to be better than edge-lit LED LCDs.
The specific model we're reviewing today is
the 55-inch version, model number KD-55XF9005
in the United Kingdom.
It features a native UHD resolution, the company's
currently most advanced X1 Extreme processor,
Android Smart TV platform, and, new for 2018
and exclusively on the Sony XF90 at this time
I filmed the video in March 2018, X-Motion
Clarity light-boosted backlight scanning system...
we'll explain this in more detail later on in
the video when we discuss its motion performance.
The 55-inch XF90 or X900F retails for £1700, and sits in the middle
of Sony's 2018 TV lineup.
Above this XF90 there's the Bravia A1 and
AF8 OLEDs, and also the Sony ZD9 or Z9D...
the company's flagship LED LCD for the third
year in a row... there's rumour that the Japanese
brand will launch a ZF9 or Z9F successor with X1 Ultimate chipset at IFA later this year, but as always
Sony can neither confirm or deny such speculations.
For a direct-lit LED LCD TV, the bezel is
impressively thin, although you'll see the
bulk once you look behind the television.
There's a small "Bravia" inscription on the
top left corner, and a Sony logo along the
bottom of the screen.
But perhaps the most controversial design
element on the Sony XF90 or X900F is its feet
which open outwards.
They're designed to accommodate Sony's XF9000
soundbar, but require a wider base as a result.
If you own a narrower AV rack, you can also
point the feet inwards to reduce the footprint,
although this way of mounting the feet isn't
mentioned in the user manual at all.
There are grooves behind each feet to route
your cables for a cleaner look, and unlike
last year's XE90 and XE93, the XF90 doesn't
use an external power brick.
The connections are found on the left rear
of the display, and face either downwards
or sidewards.
There are four HDMI sockets, but just like
what we've seen from Sony X1 Extreme TVs over
the past couple of years, only HDMI inputs
2 and 3 are the full-fat HDMI ports that can
do 4K HDR at higher bit depth, frame rate
or chroma once you go into the user menu and
switch on HDMI signal "Enhanced format".
The supplied remote control has received a
minor facelift from last year, with discrete
buttons and slightly weightier feel.
The Sony XF90 uses a VA-type LCD panel with true RGB subpixel structure, as you can see
from our macro shot here.
This means deep blacks by LED LCD standards, but narrower viewing angle compared with IPS
LCD or OLED, so you're advised to watch the TV straight on for the best picture.
For SDR, once peak white was aligned to our normal dark-room target of 120 cd/m2,
black level from the centremost
black patch on a 4x4 ANSI chequerboard pattern
measured 0.05 cd/m2 with
[Auto local dimming] switched off.
Engaging [Auto local dimming] can potentially lower black level to 0.04 cd/m2...
the correct setting is the one that
strikes a good balance between achieving a
higher contrast and keeping blooming or haloing artefacts to a minimum.
Which brings us to the number of local dimming zones on the Sony XF90, one of the key data we want to know
about any full-array local dimming or FALD
backlighting system.
Using our own custom-authored test pattern consisting a small white box crawling horizontally
and then vertically against the edges of a
black background, we counted six vertical
columns and eight horizontal rows, giving us a total of 48 independently dimmable zones,
which is not too different from its predecessor the XE90.
Using a reference JETI 1511 spectroradiometer,
we captured the XF90's spectral power of distribution,
and confirmed that it is using PFS LED to
achieve a wider colour gamut.
Like Sony TVs since 2016, there are two-point and 10-point white balance controls on board,
but no advanced colour management system or CMS.
Fortunately, after calibrating the greyscale
and adjusting the [Colour] control to fix
some initial undersaturation out of the box,
all the colours clicked into place very nicely,
with none of the 140 measured
colour patches in this fairly challenging
Colour Checker SG chart exhibiting visible
errors, so SDR movies will look supremely accurate
and realistic especially in terms of skin
tones.
Uniformity is very good.
On full-field grey slides, the corners looked
slightly darker, as had been observed on recent
Sony LED LCD TVs, but there's no significant
banding or dirty screen effect.
When I spoke to Sony engineers at CES earlier this year, they said that they have been making
efforts to improve factory calibration at
the manufacturing phase, and judging from
this TV here, the result is clear to see.
Remember that this is not a cherry-picked
sample sent by Sony, this is a retail unit,
totally new and boxed, randomly plucked from stock.
And on that note, I would like to thank Richer Sounds Manchester again for loaning this TV to us for review.
Without them, I wouldn't have been able to
get to test this TV this early, so
if you're considering purchasing
a TV, even if it is not going to be the Sony
XF90, please consider buying it from them.
Call them on 0333 900 0086. say that you watched the HDTVTest
video, and they'll sort you out with excellent
service and prices.
Now, even if there's no physical DSE present,
some full-array local dimming LED LCD TVs
can have the FALD grids visible especially
in slow panning shots across a uniform background,
but we haven't really noticed that on this Sony XF90, after watching this torture test from
Arrival, as well as several football matches
on the TV.
The Sony XF9005 is equipped with the company's
currently most advanced X1 Extreme video processor,
an upgrade over last year's XE90.
The scaling done by the X1 Extreme chipset is the best we've seen from a consumer television, extracting crisp
detail without excessive ringing from less-than-pristine sources, as you can see from this SMPTE RP-133
test pattern in 576i.
We're also big fans of the [Smooth Gradation]
feature which is very effective in reducing
in-source posterisation which is present even
on discs, such as animation movies or the
Ultra HD Blu-ray of Planet Earth II.
We need to talk about X-Motion Clarity, the
most important feature on the Bravia XF90 series
which sets it apart from other Sony TVs, or
any other TVs on the market for that matter.
First, some background.
TVs are broadly categorised as either hold-type
or impulse-type displays.
A hold-type TV displays every frame continuously
until it is replaced by the next frame.
Research have shown that it is the persistance
of these frames in our brain that contributes
significantly to what we perceive as motion
blur... otherwise known as the sample-and-hold
effect.
Impulse-type TVs, on the other hand, do not
display each frame continuously.
Examples of impulse-type TVs are CRTs and plasmas whose inherent decay of phosphor
creates a natural fade-to-black interval between
each frame, which...
amazingly... refreshes our brain, reduces
the retinal persistence, and makes the motion
look much clearer.
Understanding the science behind it all, some TV manufacturers have implemented backlight scanning
or black frame insertion on their TVs, which
artificially inserts black frames inbetween
the original frames to mimic impulse-type
motion.
However, as you can imagine, there are a couple
of well-established side effects when you're
injecting black intervals into the picture...
one, the light output drops, so the picture
appears darker; and two, more flicker is introduced.
What Sony's innovative X-Motion Clarity technology is designed to do is to harness the full-array
local dimming capability and peak brightness potential of the Sony XF90, then use the power of the
video processor to locally boost the brightness of the LEDs where the black frames are inserted,
resulting in a clearer picture that's not
significantly darker.
I'm going to call this technique black zonal
insertion, which... come to think of it... could be
euphemism for shagging *censor beep*. Not that I have any experience with that of course.
Anyway, the results are extremely impressive...
the motion clarity, not the shagging... allowing
the Sony XF90 to achieve 1080 lines of motion
resolution according to this horizontally
scrolling test pattern, and there's only the
slightest hint of luminance drop, between
50 and 100 nits depending on your initial
backlight setting, and no noticeable flicker
at all even in bright scenes.
Now when we were briefed by Sony at CES earlier
this year, we were under the impression that
X-Motion Clarity is only activated by specific
[Motionflow] "Custom" settings, but after
intensive testing, we found that X-Motion Clarity is active in [Motionflow] "Smooth", "Standard" and "Custom"
with [Clearness] set to 1, as you can see
from the increase in flicker in these camera
footage which I purposely shot at a different
frame rate to amplify the flicker... the flicker
is ONLY visible on camera, not in real-life
viewing.
Bear in mind that to get the highest motion
clarity with [Motionflow] "Custom", the [Smoothness]
slider needs to be set to a value where some soap opera effect or SOE is inevitable.
This is not normally a problem because Sony's
soap opera effect is less offensive to the
eye than many other TV brands', and because
realistically you only need higher motion
clarity for watching video-based content like
fast-action sports, you can turn off [Motionflow]
when watching movies.
The Sony XF90 delivers an impactful HDR experience.
Once calibrated to D65 white point, peak brightness
reached over 1000 nits on a 10% window, and
a very impressive 680 nits full-field.
And unlike Samsung UHD Premium-certified edge LED televisions, this level of peak brightness can
be realised in real-world HDR content too
on the Sony XF90.
Despite the relative low number of independently
dimmable zones, Sony's local dimming algorithm
does well to minimise haloing or blooming
artefacts particularly with some gentle ambient
lighting, but in this challenging scene from
The Revenant, you can see the zones lighting
up with the appearance of the subtitles...
OLED is undoubtedly superior here, both in
terms of black depth and lack of blooming.
Like all Sony HDR TVs to date, the Bravia
XF9005 ignores static metadata in HDR10 movies,
as you can see in these charts depicting the
same EOTF tracking regardless of whether the
MaxCLL was 1000 nits or 4000 nits.
The TV uses its own analysis to process and
display HDR videos, and the tone-mapping algorithm
favours maintaining overall brightness or
APL (this stands for Average Picture Level)
over preserving specular highlights, so specular highlight detail over 2000 nits in HDR movies
will be clipped, such as the sun in the movie
PAN which was mastered to 4000 nits.
DCI-P3 colour gamut coverage measured 94%...
although this exceeded the specification required
for Ultra HD Premium certification, it's slightly lower than what you would expect from high-end
televisions, so saturated colours won't look as rich and vibrant as OLEDs and Samsung
QLEDs.
The onboard X1 Extreme chipset could be firmware-upgraded to support Dolby Vision in the future, but
who knows when the Dolby Vision firmware will
arrive...
Sony customers who bought the ZD9 or Z9D have been waiting for more than a year, so if you're
thinking about buying the XF90 or X900F, it's best to treat Dolby Vision as a bonus rather than a must.
That way you won't get disappointed.
The XF90's input lag figures are consistent
with what we've previously obtained from other
Sony TVs with X1 Extreme chipset, measuring 25ms in 4K HDR mode, but increasing by one
frame to 42ms for 1080p video signal due to the scaling involved.
So for gamers using PS4 Pro or Xbox One X consoles which send out 4K videos by default,
the Sony XF90 feels very responsive, but for
Nintendo Switch which is 1080p only, the TV
might feel a bit more sluggish.
To sum up, the Sony XF90 is an upgrade in
many ways to last year's successful XE90,
with higher peak brightness for more impactful
HDR, more advanced X1 Extreme processor that
can support Dolby Vision in the future, and
most importantly, new X-Motion Clarity black
"zonal" insertion technology that improves
motion clarity without significant flicker
or luminance drop. The number of local dimming zones or DCI-P3 gamut coverage could be higher, but then again, this would increase the total cost.
In the United States, you've got the TCLs
and Vizios which can give the Sony X900F a
run for its money, but here in the UK and
Europe, we genuinely cannot think of another
2018 LED LCD that can beat the XF90 in terms of sheer value for money, and so it receives our "Highly
Recommended - Best Value" award.
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