I have had the 7D for a few weeks and just shot some footage in the cockpit of an light aircraft. If you have been in aircraft cockpits lighting is crazy and changes constantly. I was shooting 30fps on full auto with a Tamton 2.8 17-35 lens and the video was spectacular. I rendered it in Compressor pro res 422 (FCP Studio 7.0)which did a quick job and dropped in the FCP timeline and the footage played flawlessly. I have also shoot video with 5D MKII and really haven’t seen any difference even in low light. For a thousand dollars it is a lot of camera for the $$$$$.
mike