All DSLRs can, and do, suffer from banding. My original 1D was horrid for it, I've seen it on a few occasions with my 1D Mark IIn.
From everything I've seen, the 50D is not as popular as the 40D - noise is worse by a considerable margin for starters. Far too many mp in a crop sensor for my liking - I really wish Canon would concentrate on quality than quantity. Canon's quality has went downhill since the 1D Mark III imho, their QA is now very poor.
Dave
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