I don’t use Canon cameras, but Vincent Laforet does. He was lucky enough to get his hands on a Canon EOS 5D MKII for just 72 hours, but in that time he shot a movie with the camera that he thinks is going to change the whole photojournalism industry.
Go here to read about his experience. http://blog.vincentlaforet.com/2008/09/20/
I am respecting his wishes in not showing any of the images he has posted. Just go check them out on his Blog. blog.vincentlaforet.com