I felt the same way while shooting/testing xPro2 + 35F2.0 and 35F1.4. There was too much hype about the AF- While it does perform great outdoor/bright lights but indoor/or low lights the AF is constantly hunting. I have the illuminator off so it doesn't distract my subjects and I set my mode to be performance high. This helps a bit but still not as impressed as I hope it can be. My Leica Q does a better job in low light and it's blazing fast and sharp. Let's hope they can fix this via firmware update via optimization of the software.
Regardless, I am happy with the camera because it meets my main needs, "small/discreet, ideal for streetphoto, quiet shutter when set to E-shutter, weather sealed (The Leica Q wasn't), Retro designs, great IQ off the jpegs and near canon-like support/service (Canon support is like Apple when you need them love it! ) . : )