i traded a canon 5d3 for a xpro-1 and never looked back. i shot 2000 photos of yellow stone np and all were great. for a hiking/landscape camera the xpro-1 is great.
My perfect x-pro 2 would have a 24mp sensor, no video, the same size, and a battery that can last 1500 to 2000 exposures. Also I would like weather sealing and built in image stabilazation.
I have been using a quantum t-2 flash for my last 30 or so weddings and have had no problems at all. I set the flash to f5.6 and ISO of 500, I set the xt-1 to ISO 400 and f5.6. I tilt the flash slightly upward and everything from 3 to 25 feet is exposed correctly.