Bioshock Infinite looks very pretty, but it's a bad show case for 4K.
This is my favorite of the shots you posted:
Looking at it at native res only the painting holds up. Even shrunk down to 960x540 the desk lamp still looks like a ps2 asset.
It's kind of a problem too with selling 4K tvs atm. I was looking at a 70" 4K tv couple days ago, it had a 4k demo od after earth. You could easily see the difference between the 2K rendered backgrounds and the 4K actors. Next was a soccer match demo, sure looked great, I don't like soccer though. Not a lot if interesting content available.
All the other 1080p tvs did look very soft after that 70" 4K monster.
Let's see what The witcher 3 can pull off in 4K :)