EF-X8 flash works on the X-Pro2 with ease.

Tony Phillips mentions both in his X-Pro2 book and the one about X-flash photography that the flash that comes with the X-T1 works on the X-Pro2 as well. As the flash can be bought separately (at least over here across the water in Germany), I bought one, and it works perfectly (read that, Rockwell). As it draws its power from the camera, you need no batteries, in works efficiently like a built-in flash. Great to have, I tend to leave it on the camera all the time for fill-flash use.
Michael...

EF-X8 flash works on the X-Pro2 with ease.