Mine is 17 "(1280 x 1024) LCD so thats maxed out for me.
Turning On DX 11 the diffrnce I could notice was "Blur" thats about it.
I have read that DX 11 is supposed to be 35 % faster thn DX 10.1 and should look much better.
When I played Dirt 2, I was like really wow it looked so real so smooth fps were damn good.
Actually its good for the Future of GPU manufacturers as they wld have few GPUs to sell in the name of DX 11.
Does this game looks better than Crysis. NOt at all. Even with DX 9 .. crysis look phenomenal,Even COD MW/2 looked better. Things like DX 11 and stuff are good for selling yr GPU units.
Gameplay is still and will remain the number one concern for game developers. ( It should be actually as gameplay is coming down and Graphics are going up).