Is AF on par with say, a Nikon 85/1.8G or Sony 85/1.8FE?
I would say build wise its better than the 85mm FE, but AF is behind, and it's not quite as sharp. The 85 is an amazing lens for $500.I have FF Sonys (A9/A7Riii) for my limited remaining commercial work and the 85/1.8. I’m loving my X-Pro 2 and X-E2 for the mechanics, crazy unexpected sharpness and joy of using. There is just a “life” in the jpgs that I appreciate. I wanted the Fuji cameras for fun and travel.
After 30+ years as a commercial designer and photographer, I now teach high school students in our local arts academy. On day one I discovered we use X-T2 outfits to teach photography basics. Once I used it, I was hooked but prefer the “rangefinder” versions.
I see the different uses for the 50 and 56, that’s not an issue. I’d love a go-to portrait lens and 80/90 seems too long to me. I almost grabbed a 35/1.4, but that’s a little short for my tastes in portrait shooting. Hence my interest in the 56. Sorry for the long answer...