Mike Chaney compared the image quality on Canon EOS 20D VS Canon EOS 5D and wrote:

“The 5D is certainly an excellent camera in every respect. In addition to fantastic image quality, it also boasts long awaited features like a real spot metering mode and an LCD preview screen that is huge in comparison to the 20D and its predecessors. I’ll leave playing with the controls and taking the “money shots” to the other reviewers but I’ve certainly enjoyed my head to head comparison and hope that others can benefit from the information here. Say what you like about form factors, 1.5x - 1.6x versus full frame, but I suspect full frame sensors might be here to stay after these initial entries come down in price a bit. And for those of you who don’t want to give up your 20D for a 5D because you do a lot of telephoto shots and you actually like the 1.6x form factor, remember that the 20D might have a 1.6x form factor to get you closer with telephoto but the 5D has 1.25x the pixels as the 20D on both axes so you can recover at least some of that extra magnification by just cropping your photos since you have so many pixels to work with.”

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