I didn't see anyone mention what I consider the biggest difference between the X-Pro2 and forthcoming X-T2: the availability of an optional battery grip. It's not an option for the Pro2. Comparing classic DSLRs with Fuji, you're looking at 950-1000 shots per battery vs. ~350, ~700 when you add the grip. That may make a difference to you, it may not. For me it's huge, not just for the extra capacity, but also for vertical shooting.
I have Canon right now, with half a dozen lenses. I was ready to jump ship a long time ago, but I have requirements I'm not willing to compromise on. One is the battery grip, the other is a 2nd card slot. The X-T2 is where I expect to land.
