4K TV settings?

Hi all,
I’ve recently bought a LG 43UF640V, a 43 inch ultra HD 4k TV for my room.
Just wondering if anyone has a 4k TV and what settings they use?
I’m convinced that even knowing the Xbox one can only output 720,900,1080p(occasionally lol) it still looks crisper and the colours better.
Currently I’m using game mode, ultra HD mode turned on and super resolution settings.
There’s no input lag but not sure if it’s just me or things look more plastic? (Or it that just halo)
Rise of the tomb raider looks very good though.

Interested to hear from others!