What made you sell the Fuji Ray?
To begin with, I had my doubts about the Olympus. That's why I didn't sell first, then buy.
Main concerns were high iso performance, and the contrast detect AF.
But for the price it was going for, and the cash back, I gave it a go.
But once I had it, I used it more than the Fuji. The size of the body and lens, the build quality, the IBIS. The AF is not that slow, from my experience it's comparable.
High iso, the Fuji is better. But to me, it's not about having the best. It's about having what's acceptable to me, personally. The high iso performance is fine for my uses, I'm happy with it.
What really sold it to me was the bang for buck value of the system. The body is metal, it's solid, the 5 axis IBIS, the lenses are beautiful. When I used the Sony e-mount system, I didn't get that. For example, the Sony 50mm 1.8 OSS. Yes it was cheap, but it felt like a toy lens. Same with the 16mm 2.8
Fuji was nice, I owned the X-E2 before the X-T1. Even though it is considered a compact system, compared to DSLR. For me, I still wanted smaller. I missed the size of the Sony nex 6, but Sony did not offer enough choices and their cheaper offerings didn't feel quality. It felt exactly that, cheap.
The Fuji equivalent focal range 23mm and 56mm, just the cost of those two lenses can pay for the entire Olympus set up. The size and weight of the Fuji 90mm made it feel like I'm carrying an extra body, not something I wanted in a small compact system. The quality was there but for me, the size/weight/price compared to the Olympus was enough to make me decide to switch. The Fuji did some things better than the Olympus, but those were not things that were beneficial to me in my shooting.