h.264 mov from canon 5d ii is a kind of mvi.mov format, such format can not accepted by FCP, or FCE. Convert Canon MOV to ProRes will let you get uncompressed videos with pristine quality, but in big size. So will AIC codec. If you want to get smaller size video, i still recommended h.264 mov, but you need convert original canon 5d h.264 mov to mac compatible h.264 mov. The quality is exactly the same. and You can search on line by keyword convert canon 5d mov to h.264 mov to find a right one.