I was playing around with Eye AF on my a7R and it's really excellent how Sony implemented it. Instead of having to switch to another mode, you just assign it to a button. When you press the button, the camera tries to find and focus on the nearest eye and falls back to normal face detection if it can't. If that fails, you still have normal focusing without having to switch modes. This is the way camera makers need to think about mirror-less and how to get the most from it.
Now what we need is a RAW setting on Zebra and Flashes that are controllable through WiFI.