Overall image quality or IQ for short
Antonio Correia
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20D / 5D / 40D - http://wyofoto.com/40D_Image%20quality/40D_shootout.html
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That's an interesting comparison. I think the 20D held up pretty well, considering its age. I wish I were holding up as well.
Moderator of the Cameras and Accessories forums
This tells me two things: the 20D is still damn good, and Canon has been treading water on noise & pixel quality for 3 years.
So really, as far as this test goes, the 40D & 5D really only have an advantage insofar as they have more pixels to play with, thus more opportunity to smooth the noise & retain some detail.
http://www.chrislaudermilkphoto.com/