If "Lens Electronic MF" means "Lens Electronic Manual Focus" I imagine that it could be manual control of focus using electronic controls in body... Perhaps "Follow Focus" function in body itself?
You don't flip switch on lens to "Manual", just to electronic override.
One moment you use DPAF in video shot, and when you want to take over focus, then you could do it at any point, and get back to auto seamlessly.
Yes, yes, I have read it.
But does it work in video? What controls you use for manual "by wire" focusing? Why USM only?
I wish I had the opportunity to check myself, but reviews I read indicate that this "focus by wire" from 1DX and 5D3 aren't even half way towards manual "follow focus" functionality. Perhaps reviews were wrong, but I haven't seen follow focus accessories being replaced in 1DX and 5D3 setups.
I've read about touch control for aperture in 5D3. I imagine this could be done for 7D2 + touch control for focus.