I have had that problem, a lot especially with shorter focal lengths. Experienced it greens all the time on my x100s, especially in photos from Hawaii, with so much green vegetation. I have grown used to it, i guess am aware of situations that may have the effect. I also experienced it on the x-t1, I bought it three different times hoping that it was something that would be fixed with Adobe LR processing, and I couldn't get over it. I think the wider angle lenses for me produced the effect at a much higher level, i just don't think 16mp sensor was able to do a very good job of rendering those wide views. That's not scientific, just my view. I didn't notice it as much when i tried an X-pro1 for some reason, but x-pro1 files to me looked better for some reason, not sure if it was because of the first generation x-trans sensor or what. As i have used the fuji system though, I have pretty much stopped sharpening raw files altogether. I recently got the x-t2 and have noticed the watercolor effect less when using the 10-24mm lens, but not nearly as bad as the same lens on the x-t1. The other place I've experienced watercolor effect is in rock/mountains. on wide shots, detail of rocks shows the watercolor effect, especially when you're looking at it at 100%.
With too much time on my hands, I tend to really pixel peep, and has that lead to disappointment on almost every digital camera I've owned. When printing images, or posting them online, they look fantastic. More than anything I have started to ignore it, or maybe it's that I no longer focus on it. I have really enjoyed using the fuji system, and the watercolor effect is just about the only thing that I've had a problem with so far. I've have iridient developer on my mac, and it does seem to produce better detail, and less watercolor effect, but it feels clunky compared to LR CC, and so I end up not using it often. Good luck to you in your search.
