HDR is the big thing for console gaming, becuase it is essentially free perfomance wise.

4k is lovely n'all, but even the xbox one +/super/mega is going to struggle to run new games at max settings at 4k.
Almost all demanding games downscale to something less than 4k (and less than than fullhd in the case of the standard PS4/XboxOne).

Make sure you tv supports:
HDR10
600 nits brightness
DCI P3 colourspace
edge-lit/full-array local dimming.

https://referencehometheater.com/201...nd-statistics/