The 50HK5601 is a 50 inch 4K TV from Hitachi, launched in the year 2021. It comes with a 10-bit VA panel. It can achieve a maximum resolution of 3840 x 2160 with a refresh rate of 60 Hz and pixel density of 89 ppi.
Picture Quality
Now, the very next specification of a display that will impact your viewing experience is Color Gamut.
Hitachi did not provide a color gamut specification for this TV. But don't worry, we have other means to guess that.
As this TV features amassive 50 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 quality on this TV should be Lifelike! It will produce accurate colors out of the box.
What Color Gamut means ?
Color gamut spec of a TV is a measure of the range of colors that the display can display.
A TV with poor color reproduction will produce washed out colors that will not be pretty to look at.
Different manufacturers use different units to define color gamut. Such as — sRGB, NTSC 1953, DCI P3 to name a few.
But you don't need to worry about that, here is a chart that will help you choosing a TV with good color accuracy.
Other than color accuracy, you should look at the static contrast specification as it impacts the picture quality the same way.
Understanding 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 SC ratio less than 1000:1 may produce black images something like this:

Moreover, such TVs may suffer from backlight bleeds that will rob your experience — as shown below.

Also, a TV with high constrast ratio lets you to see more details. So, resolution and static contrast ratio go hand in hand in a sense.
If given a choice, I will prefer a FHD TV with high contrast ratio over a 4K TV with low contrast ratio.
This TV comes with a static contrast ratio of 8000:1., enough to display deep blacks and eye-catching visuals. The panel comes with local dimming which is a plus.
HDR is also supported on this TV in form of HLG (Hybrid Log Gamma), HDR and HDR10.
As for brightness, the peak brightness the Hitachi 50HK5601 can achieve is 250 nits. The backlight used on the panel is Direct LED.
Gaming Performance
If you are planning to use your TV just for content consumption, you can ignore these specs. But if you are also planning to use the TV for playing games or use it as a PC monitor, make sure to get a TV with the lowest input lag and response time.
Unfortunately, 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.
What is Input lag ?
This lag is the latency at which your key-presses/mouse movements changes the content of your TV. For casual Non-FPS games, input lag doesn't matter much.
For best of both worlds, look for a TV that features an input lag and response time of < 20ms.
Dimensions and Ergonomics
Vertically, the TV measures 50 inches and horizontally 44.68 inches.
Overall it weighs approximately 10.6 Kgs including stand. Without stand, it weighs 8.8 Kgs.
Now, coming to ergonomics — VESA mount is supported on this TV with an interface size of 200 x 200 mm. There is no Swivel, Tilt or Pivot feature support in this TV.
Hardware and Audio
The Hitachi 50HK5601 comes with a Quad Core CPU. However, Hitachi didn't provide any specification on the total available RAM on the TV's specsheet.
The UI on this TV is powered by Android 10 Operating System.
For display connectivity, there are two HDMI 2.0 (ARC; CEC) ports and one AV Composite In (Video + L/R) port on this TV.
To connect USB devices, it includes one USB 2.0 port. Other connectivity ports include — 1x Satellite In (Main — F-type female), 1x AV Component In (YPbPr + L/R) (via PC input), 1x Antenna (RF) (female), 1x CI+ 1.4 and 1x Ethernet RJ45.
Wireless connectivity options on the Hitachi 50HK5601 include a 5Ghz Wi-Fi, 2.5 Ghz Wi-Fi, Wifi-Direct, Bluetooth and DLNA.
The Audio unit of this TV is powered by 2 x 10W speakers.
As for power consumption, this TV consumes 113.6 watts on average and 0.5 watts on standby.
For powering this unit, you'll require an 220 V - 240 V/50 Hz - 60 Hz outlet.