The higher the resolution the higher the details:
But for that picture you posted to make sense it would be Batman's face from a great distance. Do we really that level of clarity from something far from the screen? Maybe on a massive screen its nice and noticeable, but you couldn't really notice it on an average living room TV? Not really.
For example, we can already see enemies far off in the distance in a 720p game, in 1080p that distant enemy become more clear and crisp, but do I really need 4K to see his tiny face a little more clear? I'm not sure if that's gonna make a big difference on the enjoyment of the game.
Resolution certainly matters, but there is diminishing returns. I mean I would like to see a game on the X1X that pushes the full 6TF on cutting edge graphics over 4K.
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