The Canon 5D Mark II brought with it another revolution, though it wasn't quite as universally praised, and it also wasn't the first. Video. In a DSLR. The D90 was first to this game, but Canon seems to have done a better job of it. There's more to it than just video, of course, but here's 5 reasons I'm holding out on Canon's 5D Mark II... and 5 reasons I can't wait to stop waiting.