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Yeah my test was hardly scientific, and I wish I would've done multiple exposures and checked focusing. You know what I mean? I dicked it up, because what I did was like focus/recomp on the tripod. It was awhile ago, but if I had access to a 40d I'd do it again with a prime (at that point I didn't own a prime; just zooms).
They were processed the same way, but flash was ettl I believe.
Also for what it's worth, my 7d and old 40d produce sharp captures.