Why no USB 3.0 on the 5D Mark III? For the same reason the 5D Mark II has the same autofocus as the Mark I: so that Canon could have something to upgrade to get you to buy the next one.
Actually, I didn't. I have good CF cards, and it would take me a while to buy a 5Dmk3 (assuming I'd buy one), so I didn't check for specific SD features support.
Mt Spokane Photography said:
If you have a UHS card reader you are ok, but the article is about USB 2 in the camera body.