He also had an XE-2 here and we couldn't really see much difference in AF speed in low-light. It tracks better using the AF points that use the PDAF, no doubt about that, but as soon as you're outside into the edge AF points it's no quicker that we could see in real terms.
My understanding is that in low light its just as slow as previous models as it switches back to CDAF only. I noticed this with my XP1 and X100s. I still think hybrid focus needs a lot of work.
Moving the AF points around isn't as quick as just hitting a d-pad but there's no reason why that couldn't be sorted with firmware.
Fuji users have wanted that for ages, cant understand why they dont sort it.
IQ-wise we could see no difference against his XE-2.
Same sensor, no surprise
BUT - very light, very compact and very well built (on a par with the Df I'd say, but obviously smaller and lighter). It's certainly an excellent camera and extremely well-priced.
Thanks for taking the time