4K is the worst thing TV manufacture came up with. 1080P is fine. At most 2K or 1440P. More detailed gfx/affects is more important. This is the advantage that PC gamers have as they can scale gfx setting/resolution according to their preference.
I feel the jump to 4K is justified even if not absolutely necessary. It does create a noticeably more sharper image even if not exactly day and night difference. I also like games push higher native resolutions for super sampling on lower res displays.
Ideally though I don't like to jump above 1080p if its compromising graphics potential. The amount of pop in BFV on X1X can be jarring because the settings seem to be at par with base consoles.
Uncharted: Lost Legacy for PS4 (4/5) - EA UFC 3 for X1 (4/5) - Doom for X1 (4/5) - Titanfall 2 for X1 (4/5) - Super Mario 3D World for Wii U (4/5) - South Park: The Stick of Truth for X1 BC (4/5) - Call of Duty: WWII for X1 (4/5) -Wolfenstein II for X1 - (4/5) - Dead or Alive: Dimensions for 3DS (4/5) - Marvel vs Capcom: Infinite for X1 (3/5) - Halo Wars 2 for X1/PC (4/5) - Halo Wars: DE for X1 (4/5) - Tekken 7 for X1 (4/5) - Injustice 2 for X1 (4/5) - Yakuza 5 for PS3 (3/5) - Battlefield 1 (Campaign) for X1 (3/5) - Assassin's Creed: Syndicate for X1 (4/5) - Call of Duty: Infinite Warfare for X1 (4/5) - Call of Duty: MW Remastered for X1 (4/5) - Donkey Kong Country Returns for 3DS (4/5) - Forza Horizon 3 for X1 (5/5)