I've used this camera now for 6 months and own 3, 5D bodies! I've used it with the following Canon lenses:

24-70mm f/2.8
70-200mm f/2.8
85mm f/1.2
200mm f/1.8
300mm f/2.8

I've shot EXTENSIVELY with all lenses WIDE OPEN and have not seen ANY vignettely indicated by a couple of other reviews. Are you kidding me? This thing is super sharp from center to edge.

The full-frame censor comes in mighty handy when you need to crop and don't think this is an insignificant thing. If you can perfectly frame all your shots then maybe you don't need this capability.

I would highly recommend this camera as the absolute be value out there in a DSLR regardless of brand.