I own the X-Pro1 and have not been inclined to replace it until or if Fuji comes out with an upgraded model ( XP-2? ). But a very discriminating and respected friend of mine, a long time Canon enthusiast who would never think of any other brand switched to the Fuji XT-1, which got me to thinking.
I love the hybrid finder of the XP-1 which is why I bought the thing with full knowledge that it had some problems such as IQ of the EVF, slower operation and alleged smearing of foliage. Since then I never looked back.
The camera is a remarkable image maker.
Recently, I checked the comparative IQ's on DP Review's comparison page.
The only real world difference I can determine is that the XT-1 has ever so slightly brighter colors in RAW. I never shoot anything else. But since I post process anyway, the slightly brighter color issue is not significant.The IQ as displayed on the site is not so different that I'd be tempted to buy the XT-1 or the XT-10. Lab results may show better images with the T's over the P, but will the difference really be apparent in the real world?
I'll wait to see if they replace the X-Pro1 with a new hybrid finder model and I may consider the switch if the EVF on the new model is significantly better, assuming everything else like sensor size and resolution remain the same. The XP-1 is still just that good.