Sharper, better image quality and no fucking crop.
The 5D mkII is gonna kick some serious 1D mkII ass. :P I do have one L lens and as I am aiming for photography as a profession the prices won't be so much of a problem anymore. And if everything goes according to plan I won't need so many lenses. My 17-40 will be an awesome wide-angle on FF, and then I'll buy a 70-200 2.8L. Maybe an 85 1.2 L II.

But anyways, this is pretty OT...