Yes. This just in.
There hasn't been a game released yet where DX11 has had a noticeable impact on graphical quality.
So get over crysis 2 not having DX11 because it still looks and plays great.
AVP begs to differ. Tessellation significantly improves the models, particularly the aliens. Tessellation also does wonders in Metro 2033.
On the DX11 front, the last I heard was that crytek stated they had no idea why people believed the dx11 patch was going to be released, some time back, and that they had not started production of a dx11 patch.