I handled an X Pro-1 at a local dealer, and do like the way it feels in my hands. It is very comfortable to hold in my right hand, with no controls interfering with a comfortable grip. Notably, the X100 has a wheel and at least one button that interferes with my right thumb, so the X Pro-1 is an improvement in that regard. The X Pro-1 has certainly not caused a resurgence of acute GAS*, but I am going to be paying attention to user reviews, firmware updates, and such.
*GAS = Gear Acquisition Syndrome.
Canon 5Ds R/7D2/7D/5D/40D/1D2N; Nikon F6/D3s/D700/FM3A/Coolpix A. Lens selection undergoing changes; some favorites: Zeiss 2/135 APO Sonnar, Canon 100mm f/2.8L Macro IS and 135L, Nikkor 14-24/2.8G and 200/2 VR.