is this regarding video or stills? i have the 7D, same chip, its about 1/2 stop cleaner than my 1d mark III at high ISO. i still regard the 1d Mark III at only 10MP as having better image quality. still getting used to the 7D tho, its my backup rig, just has to work, and I shoot video on it alot.
I went from having a back up camera, aka a bicycle vs a car aka my 1d3, to having a second car for my backup, but its got its own charm.