First session using the Sony A7 + Zeiss 55mm f/1.8 today. Definitely nowhere near as intuitive using scroll wheels instead of the aperture rings and dials on the Fujis. I lost track of what my aperture was a couple times since it wasn't baked into my head via aperture ring manipulation, and the auto ISO function didn't seem to be working appropriately for keeping me in ideal handholding shutter range (it's not customizable for minimum shutter and seems to think 1/60 is acceptable before bumping ISO, when I'd rather ~double the focal length...) so I had to go manual.
Manual is workable since you can still auto ISO and exposure comp, at least, but a lot less fire and forget than aperture priority with minimum shutter speed + auto iso, taking me into unnecessarily high ISO a few times with the variances in metering. At least auto ISO is customizable min/max.
No problems with AF speed/accuracy or speed between shots, EVF is good, love the tilting LCD, and the grip allows you to comfortably shoot with a single hand. Didn't try out the AF eye detection in this shoot (wasn't aware of it until just now, actually), but that sounds a hell of a lot more useful than Fuji's face detection (which isn't precise enough for critical focus with narrow dof). Sony's focus peaking implementation is nearly perfect, making manual focus easy and fun.
So there are definitely some usability problems compared to the Fujis. The photographic results are so much better than my X-E2 w/ 35mm f/1.4, though. This Zeiss FE 55mm f/1.8 is INSANELY sharp edge to edge at any aperture and pops like nothing I've used, plus all the full frame sensor benefits, plus RAW support that isn't questionable.
Waiting on a more refined second generation body and more native lens availability is the prudent way to go here, probably, but I don't regret picking up the A7 so far. I may have if I had bought an A7R, though, with its worse AF and lightning strike shutter.