Well, I was out today in some less friendly conditions in Iceland shooting with both Fuji and Nikon. As the weather wasn't pretty I kept the lenses I started with, the 55-200 F4.5-4.8 on Fuji X-T2 and the 24-120 F4 on Nikon D750, both handheld and tripod, but mostly tripod. The weather was bad and the tripod way flimsier than what I hoped. At the end of the day I have significantly more usable shots (as in sharp enough) on the Fuji, and not just because of the more favorable focal length. For various reasons I couldn't get the Nikon to compensate for the suboptimal conditions despite having a clearly better sensor and the advantage in resolution (less pixel density which in their should be more tolerable to shake and requiring less sharp lenses). I probably would have been better with another X-T2 with the 18-55/ 16-55 instead of the D750 with 24-120. Or maybe even the E-M1ii with 12-100.
The reason I used the Nikon with the 24-120 was because I trusted it would not likely fail in that weather (was also snowing). So far the 55-200 is holding but I took some chances.