I'm getting full usage on my 5850s. Latest Cats and profiles.
This update is really, really good. Not only does it look fantastic, it seems to be very well optimized. With all of the DX11 extras, except for tessers, I get a better fps than I ever did with just the DX9 version. Tessers does seem to be the biggest FPS hit.
The only problem I have is that it now has the same bug that the other Crysis games had in DX10 where it always switches the refresh rate to 24hz when it starts. Does anyone know how to get around this? I think you used to be able to get around it with an ALT+F10 or something but I've forgotten now.