I don't know if I would say "there is something wrong" with the old mk2's.......sure there's a chance, I know the one I bought put out terrible images.......UNLESS you sharpened the living daylights out of them, then they were good. Myself I believe Canon thought the pro's buying this camera wanted NO in camera processing, but they found out they were wrong. They might have discovered that a major percentage of the buyers just wanted a pro camera, and didn't really want to spend their time post processing EVERY shot. I'm a perfect example. I'm no pro, I just shoot for fun but I like having the best equipment and I can afford it, but the post processing was a drag........so I returned the old mk2, and always saying "if Canon could make the mk2 have sharper images I would buy another one in a heartbeat". Enter the Mk2N. Canon's not stupid, why would they HAVE TO sell me a 20D when I really can afford (and want) a Mk2? Canon knows "Bling"! Lets face it.........can that old man really drive that Corvette.........hell no, but he sure looks good in it. Canon understands this, that's why they make a upper level camera that has the best of both worlds.....great shots right out of the camera, or process your little heart out..........and those are just the jpg's.......of course there's always RAW.
Don't know if I am right or wrong, but that my take on this.