A little overpriced for the meager upgrades in this camera. Nothing extraordinary-- just a revised 5D with some less-then-new Canon upgrades. Not the most exciting purchase if you already own the Mark II.
Silent ing mode; upgraded ISO levels; redesigned button layout
Terrible focus on the outer focus points when using fast primes at 50mm or wider (very poor on the 50L); Will constantly front focus, it's a known problem that makes the new autofocus system useless for wedding photographers; Works great for telephoto lenses