Canon DSLR HD Video Shootout - 550D vs 7D vs 5D Mark II

Canon has 3 SLR camera with which you can shoot HD videos. Starting with  entry level cameras like the Canon 550D/T2i, Canon EOS 7D and the professional level camera, Canon EOD 5D Mark II.  Those three Canon cameras have pushed HD video recording to a new level. You are probably asking yourself: "Which one is better for video recording?". Let's start by giving a big credit for Canon for