When eye-af actually engages on the R and RP with this lens it nails it. But 8 times out of 10 face detect fails when someone is wearing strong glasses. MF + 10x magnify works wonders in that case, I haven't tried to use touch-and-drag AF for this yet.
Jared mentions this in his review as well, but I like to highlight it as well: when racking focus from MFD to infinity you can feel something large and heavy inside the lens shifting. That brings a smile to my face every time!
Unfortunately I have to return it to the rental place next week
Not sure whey Jared wouldn't use face detection and eye detection to even see if it worked for him. He just assumed it wouldn't work for him...how lazy. I use it all the time for weddings and portraits and I have absolutely zero issues.