Quote Originally Posted by Scott Stephen View Post
I assume everyone would agree that based on the ISO comparison tool on this site, then, the Canon beats the Nikon?
That's my view. Looks like Canons are generally sharper and with fewer aberrations. I anguished over them (as well as a variety of other lens tests) for a while before I made the switch to Nikon.

Quote Originally Posted by Scott Stephen View Post
(Yes, different bodies = apples vs. oranges)
Yes, different bodies as well as raw conversions. It's possible to mount Nikon lenses on Canon bodies (though not vice-versa), so an apples-to-apples comparison could be done -- I think it would be very interesting.