Thanks for your input guys, I appreciate it. I took the X-T10 and 60mm out for a spin on Sunday evening, and am absolutely in love with it in all honesty. Especially for candid portraits, it renders beautifully.
After coming from the X100s for SO long, it has taken quite a bit of getting used to the different focal length... and the X-T10 is just SO MUCH fun to shoot with. Apart from that, I've found auto focus to be perfectly acceptable and back-button manual focus to be great too. I can't wait to see how it performs at a wedding this weekend (as a guest) especially for candid moments, as that will shape things going forward into second-shooting.
I can see why so many portrait photographers rave over this lens, it really is magical.