UPDATE:
I have been pestering a lot of reps at my nearby TV showrooms just to test if the text looks crisp and monitor works at 4k @ 60Hz at chroma YCbCr 4:4:4 or "Full dynamic range with sRGB", and I tested out 3 models with my desktop and HDMI cable.
My desktop: GTX 1060 6GB with one HDMI 2.0 out.
Cable: Bluerigger HDMI high speed 2.0
Under Nvidia control panel, in the resolution section we have
>> resolution (3840x2160) available for all below tvs
>> refresh rate (60hz) available for all below tvs
>> Dynamic Range : either "Full" or "Limited"
>>bits: 8 bits available for all below tvs
>>Chroma subsampling : either "420" or "422" or "444" or "RGB"
TVs:
1. Samsung KU6000 50 inch :
at 3840*2160 60hz, it works with Limited Dynamic, 8 bits, 420; and the text in the start button was fuzzy with background shadow.
at 3840*2160 30hz, it works with Limited Dynamic, 8 bits, 420 as well as 422 supported; and the text in the start button was fuzzy with background shadow.
2. Samsung KS9000 Curved 55 inch:
at 3840*2160 60hz, it works with Limited Dynamic, 8 bits, 420; but the text in the start button was crystal clear.
3. Sony X83D 49 inch:
at 3840*2160 60hz, 8 bits, with Limited Dynamic>> 420 and 422 and 444 supported; and the text is crystal clear.
at 3840*2160 60hz, 8 bits, with Full Dynamic Range>> RGB supported; and the text is crystal clear.
Besides, this tv had Android OS with exclusive support for "Extended Dynamic range" option within the settings menu (which clearly mentioned it would enable 444 for better text clarity)
Also present were the settings for color gamut : sRGB, DCI, AdobeRGB, REC 2020, etc.