Launched in the year 2022, the XR-85X90K NA is a 85" 4K TV from Sony. It features a True 10-bit VA panel. The maximum resolution it can achieve is 3840 x 2160 with a refresh rate of 120 Hz and a pixel density of 52 ppi.
Picture Quality
After screen size and resolution, the very next specification of a display that will impact your viewing experience is Color Gamut.
Sony has not provided a color gamut specification for this TV. But don't worry, we have other means to guess that.
Considering the TV features amassive 85 inch screen, it won't come with a cheap panel, so here we can assume its equivalent sRGB coverage to be 90-100% or above. Undoubtedly The color accuracy on this TV will be Lifelike! Meaning it will produce accurate colors out of the box.
Understanding the Color Gamut Specification
Color gamut specification of a TV is a measure of the range of colors that the display can produce.
A panel with poor color accuracy will produce washed out colors that will spoil the immersion.
Different manufacturers use different units to specify color gamut. Viz — sRGB, NTSC 1953, DCI P3 Adobe RGB and rec.2020.
But you don't need to worry about that, below is a chart that you can use to choose a TV with good color accuracy.
Next in the list of important specifications that will impact your experience is Static Contrast.
Understanding the static contrast ratio of a TV
A TV with low static contrast ratio will not produce deep enough blacks and can bleed backlight as in the images below:

The above TV's static contrast is 800:1. So make sure you get a TV with a static contrast of >= 1000:1. More is better.
Also note, static contrast ratio and resolution go hand in hand when it comes to details. To put it into perspective, a TV with low contrast ratio will produce less shades of colors, thus lesser detail overall.
If given a choice, I will prefer a FHD TV with high contrast ratio over a 4K TV with low contrast ratio.
This TV features a static contrast ratio of 8000:1., enough to achieve deep blacks. The panel comes with local dimming backlight technology which is a plus.
Dolby Vision, HDR10 and HLG (Hybrid Log Gamma) are also supported on this TV, so that's a plus.
Coming to brightness, it is can produce a maximum luminance of 250 nits. The backlight of this TV is powered by Direct LED (Full-Array Local Dimming) technology.
Gaming Performance
If you are going to use your TV other than watching videos — say as a PC monitor or for gaming purposes, you should get a TV that features the lowest input lag. For gaming however, both the input lag and response time impacts the performance.
Sadly, there is no specification for input lag on this TV. But since this is not a cheap TV from Sony, input lag on this TV could be 20ms or below.
What is Input Lag and Why it matters ?
This lag is the latency at which key-presses/mouse movements changes the content of the TV. For casual Non-FPS games, input lag doesn't matter much.
But ideally, get a TV that has an input lag and response time of less than 20ms.
Ergonomics and Dimensions
Coming to ergonomics — a VESA mount with interface size of 400 x 400 mm is provided for wall-mounting. However, there is no Swivel, Tilt or Pivot feature support in this TV.
The vertical and horizontal measurements of this TV are 74.84 inches and 44.29 inches ( adjustable upto 1.57 in ) respectively.
It is 2.87 inches thick.
It weighs 45.8 KGs and 1.7 kgs extra if you include stand. So plan your space accordingly.
Hardware and Audio
The Sony XR-85X90K NA comes with a 4-Core CPU. There is no mention on the RAM on the TV's specsheet.
For display connectivity, there are four HDMI 2.1 ports and one AV Composite In 3.5 mm jack port on this TV.
To connect USB devices, it includes two USB ports. Other connectivity ports include — 1x Cable/Antenna In (F-type female), 1x RS232 (C) and 1x Ethernet RJ45.
For wireless connections, you will have — Wi-Fi (5Ghz + 2.5Ghz), Wifi-Direct, Bluetooth and DLNA.
The Audio unit of this TV is powered by 2 x 10W built-in speakers.
In terms of power usage, on average, this TV uses 158.16 watts and on standby, it uses 0.5 watts.
For powering this unit, you will need either a 110V or 220V outlet @ 50Hz-60Hz.