I am not a wedding photographer by trade but I do shoot them occasionally.
I've been extremely pleased with the performance of both the X-T1 (excellent) and the X-Pro 1 (not exactly blazing fast but still quite adequate) overall, and both cameras held their own in the wedding environment. I wouldn't hesitate to use either camera again.
I carried an X-Pro 1, X-T1, 14, 23, 35, and 55-200mm in a small Chrome camera sling bag from setup at 11AM till about 10PM, and my back and shoulders were very grateful for the reduced weight...a comparable Canon kit is/would have been murder to lug around that whole day. Also, the quieter shutter speed and lack of bulk really makes moving around in the background to get candids a little less disruptive. And every little extrabit of stealth really helps you to get out of the way...which is a win-win for everyone, as the client gets to enjoy their special day, and I get to capture more authentic moments.
The X-T1 and 55-200 exceeded my expectations, and at 8 FPS it meant I didn't miss any moments during the ceremony.
The only flaw in operation was that the X-T1 froze up once when I shot a long buffer-filling sequence on Continuous-High Speed (8FPS, all RAW). But that could have been due to a memory card issue, as I'd inadvertently loaded a cheapo SD card I usually use in my M8 (hahahahaha, the M8 is so slow I don't bother feeding it fast SD cards). The only complaint I had is that I went through like almost a dozen batteries between the two cameras, whereas my 5D MK II would have likely gone all day and night on a single fully-charged battery, and my 1D mkIV would have gone like three full days on a single battery. But then again, the dozen spare batteries I was lugging around only weigh 1/5 of the weight of just my Canon 50 f/1.2L. So I can't really complain!
And the results speak for themselves: