Caporegime
The X-T2 is far superior in performance to the X-T1, and there are already many professionals using it for portraiture, weddings, travel & landscape. So, I wouldn't let your experience with the X-T1 cloud your judgement, in my opinion. However, I would agree with you that the colour palette is different ... and individual taste will determine if that's something you can live with or not.
@capdegat : the X-T2 is pretty decent at action. I've had a quick peek at your DPR thread and would say that you need to aim for higher shutter speed to avoid motion blur. Also, what OIS setting did you have the 100-400mm set at - type 1 or 2 ? That said, Nikon is still king for action / wildlife - Fuji just simply doesn't have the fast exotic telephoto lenses at this moment in time. In good light, the X-T2 is capable, but for birding in variable conditions ... stick with a D500 and a 500mm or 600mm f4. I'm sure the D850 will also be very capable for this role .... but you will need to have the expensive glass to get the most out of it.
The 2 things that bug me the most are the 2 things that is inherent to the camera and its design.
The 1st is the UI. Whilst I can see people love it lots, but I don't like the fact that I need to use 2 hands to change my shutter speed. Small things, it is not the end of the world, but I like it if it is a dial control if i could. Or may be I could in the X-T2?
The second is the colour palette. It definitely isn't as neutral as how my eye see things, what is off with it throws me off my game a little. I don't know whether i should tweak the Green/Magenta slider or the White Balance. I end up spending ages tweaking it, it annoys me in the processing stage. I find the Canon much easier when it comes to correction the White Balance.
The aspects that I didn't mention - such as AF, pixel count, EVF, all of which I know are better on the X-T2 but my gripes with the camera for the X-T1 will also present in the X-T2, and the X-series. It is in their DNA.