I have the 5D and have had the Rebel, 10D and 20D. Of course the 5D wins hands down over these others. However if you want to shoot sports and need a huge buffer and 8-10 fps then the 3D is not for you. For everything else I like the 5D. Full frame, newest technology, comparatively light weight. You don't have to worry about blowing up prints either unless you are printing wallpaper. I have printed 4'x6' with crystal clear resolution.

Brad