Ektachrome,
I have often felt the same way as you. I have fallen under the influence of GAS and bought and sold many digital systems ranging from point and shoot to medium format. I have finally settled on the Sony A7ii (until the A7Rii comes out of course) and a Fuji X-T1 + Fuji X-100T. I cannot bring myself to part with either one. On the ergonomics side, I find the Sony is good but the X-T1 is a sheer joy to use. For me, it is by far the most intuititve and just plain pleasant camera to use since I parted with my 30 year old Canon F1. If all else were equal, I would shoot Fuji only. But all is not equal. I am sure the X-Trans sensor has a lot to do with the superb quality of the Fuji files. The colour rendering both JPEG and RAW is exceptional and I think Fuji's heritage is the reason. The problem is with high frequency (density?) detail. For many people including respected famous professionals it is unnoticeable. For me the smearing in the greens (foliage, grass, etc.) is noticeable and the "fractal-like" rendering of concrete, pottery, walls etc. is somewhat disturbing. Sony simply does not have those problems and the colour is very good indeed. The extra 8MP of the full frame sensor also do make a difference when down ressing and cropping. So, like you, I hope Fuji does eventually go Bayer.
Aswald
As I said above and as Ektachrome points out it depends on what is in the landscape. Anything with fine both repeating and random patterns will likely get the fractal treatment (as Lloyd Chambers shows - just Google "diglloyd fractal fuji") and if it is green it will get the smearing treatment. But it may not bother you. In all other respects the images are superb.
dickbarbour
Since you are so concerned about image quality do you really find that the 18-135 can replace the other lenses? Is it that good?
Cheers
Jon