Yes, I love my mark 3 too. I'm pretty bummed right now without my camera. (It's at Canon Service for calibration for another week).
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This is why I like this forum, glad you are liking the 8-15.
I would take 5D II out of the equation for one reason, fixed auto ISO @ 400 in "M" mode.
6D or 5D III
A. Take 5D III if you want to have the best AF system
B. Take 6D if you plan to shoot center AF with slightly less precise