Most DSLRs have significant image artefacts in their video modes. It amazes me that they're being used on professional productions where they aren't limited by cash, but I guess the small form factor has its own benefits.
My favourite of the DSLRs has been the Panasonic GH2 with the firmware hack. There's still some aliasing in highly detailed scenes, though.
Blu-ray Disc (and DVD) Compressionist/Author
US Correspondent & Tech Consultant, HDTVtest
ISF Certified Calibrator (Level 2) / THX Certified Professional (Video Calibration Level 2)