My friend swapped his Nikon D700 for my Canon 5DII for a day of shooting. Each of us has quite an array of high-end lenses, and we shot the premium glass (1 Tilt Shift, 3 zooms and 5 primes of each brand).
We really agreed on only two things:
1. The Nikon's auto-focus was noticeably better.
2. The Canon L-lenses (the class) have noticeably better build quality (zoom and focus precision, TS-E movements, fit-and-finish, solidity, etc.) to Nikon's best lenses.
The first point seems widely acknowledged, but I haven't seen the second point mentioned. And it was more obvious than the first.





