Originally Posted by George Jogtich
Low light performance, autofocus, frame rate, video, resolution.
Yes, as long as you avoid factors that cause diminishing returns, such as motion blur and missed focus. For example, if you use a tripod and focus with liveview, you can be certain to get the the full expected benefit (34% more linear resolution). But if you get a lot of blur from camera shake and miss critical focus, the resolution will not be any better than the 40D (only the same).
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