Launched in the year 2021, the 65HAK5350 is a 65" 4K TV from Hitachi. It features a 10-bit IPS panel.
The max. resolution it can achieve is 3840 x 2160 with a refresh rate of 60 Hz and a pixel density of 68 ppi.
Picture Quality
After screen size and resolution, the very next specification of a display that will impact your viewing experience is Color Gamut.
This TV doesn't come with a color gamut specification, but don't worry, we have other means to guess that.
Considering the TV features amassive 65 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 should be Lifelike! It will produce color accurate images AS IT IS intended.
What Color Gamut means ?
Color gamut spec of a display is a measure of the range of colors that the display can show.
In other words, it indicates the ability of a TV to produce accurate colors. A TV with low gamut coverage will miss out on some colors (such as deep red), so the image produced will look "washed out" in colors.
Different manufacturers use different units to specify color gamut. Viz — sRGB (most popular), NTSC, 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.
Now, next in the list that will impact your experience is Static Contrast.
What is Static Contrast ?
There are two types of contrast specifications for a TV. Static and Dynamic. We are interested in static contrast ratio as dynamic doesn't matter much.
This specification defines the intensity of black levels. That is, a TV with static contrast ratio < 1000:1 may produce black images something like this:

Apart from that, such TVs are likely to suffer from backlight bleeds that will rob your experience — as shown below.

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 show both dark gray and black as black, so 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., good enough to produce deep blacks. For the record, it also comes with local dimming technology which is a plus.
HDR is also supported on this TV in form of HLG (Hybrid Log Gamma), HDR, HDR10 and Dolby Vision.
Coming to brightness, it can go as bright as 350 nits with the help of Direct LED backlight.
Gaming Performance
Now if you are going to use the TV other than using it as a TV — like as a PC monitor or for gaming purposes, you should take a TV that features the lowest input lag. For gaming, both the input lag and response time impacts the performance.
Sadly, we cannot find the input lag specification for this unit. But as this is not a cheap TV, we can expect an input lag of less than 20ms.
Understanding Input lag and response time
This lag is the latency at which inputs changes the content of your TV. Though, this won't matter much if you aren't into competitive/FPS games like call of duty.
For best of both worlds, get a TV that has an input lag and response time of < 20ms.
Dimensions and Ergonomics
The vertical and horizontal measurements of this TV are 57.56 inches and 35.91 inches respectively. It is just 2.95 inches thick.
It weighs around 17.05 kgs, another 2.55 kgs if you include stand.
Speaking of ergonomics — a VESA mount with interface size of 400 x 200 mm is provided for wall-mounting. The unit doesn't come with either Swivel, Tilt or Pivot support.
Hardware and Audio
The TV is powered by 4-Core CPU. There is no data on the RAM on the TV's official specsheet.
To power its UI, the TV runs Android TV Operating System.
For display connectivity, Hitachi has provided three HDMI 2.0 (ARC; CEC) ports on this TV.
To connect USB devices, it includes two USB 2.0 ports. Other connectivity ports include — 1x Satellite In (Main — F-type female), 1x CI+ 1.4, 1x Antenna (RF) (female) and 1x Ethernet RJ45.
For connecting to this TV wirelessly, you will have — a 5Ghz Wi-Fi, 2.5 Ghz Wi-Fi, Wifi-Direct, Bluetooth and DLNA.
Now, for audio, Hitachi has provided 2 x 12W built-in speakers on the 65HAK5350.
Speaking of power usage, the TV consumes 174.4 Watts on average and 0.5 Watts on standby.
For powering this unit, you'll need an 220 V - 240 V/50 Hz - 60 Hz outlet.