2 frustrating things with 5DIII.
1. Magnification button is now on the left side. Moronic move as it makes it impossible to manually focus continuously with left hand while hitting the magnification button (previously with right finger) to hit focus in live view. If anyone knows how to configure a button on the right side as magnification button, please share.
Assign it to the SET button, it's not perfect, but not near as awkward as it feels being on the far left.