It all depends on what and how you judge AF on. Now if you're into fast moving scenarios such as racing, sports, or animals moving quickly, then some of the older Fuji cameras aren't up to that task very well. But they've gotten better to be sure and the X-A7 is a big step up. I've always been enamored with the X-A series of cameras - ever since first obtained the X-A1, a 16 MP little wonder. I think that Fuji does the bayer sensor quite well.
For general photography I find them to be superb for a number of reasons. The X-A5, which I have, is a huge step up from the previous models (X-A1, X-A2, and X-A3). The X-A7 is an improvement in a number of areas over the X-A5 from what I hear and read. But since I'm not into video (as of yet), there's no need for me to acquire an X-A7.
And something that I didn't mention is the fact that Fuji is outstanding with regards to firmware updates. They won't hesitate to release FW updates to both fix things and to also add more features. I've seen them release FW updates for some cameras already 4-5 years out of production and that was to add some features - now go figure?
But the bottom line is that all camera brands make various models capable of netting you superb imagery. Just settle on one and then focus on that brand and build your system.
Also - I should have spent a bit more time talking about the kit lens - XC 15-45 F3.5-5.6 IS PZ. This is one of the lightest lenses I've ever seen and felt. At first, you'd be thinking to yourself, "What in the hell is this cheap lens good for?" Yes, it's all plastic to be sure. Once you attach it to the camera and begin taking photos, you'll be shocked at the superb IQ levels this optic is capable of achieving. More so, because of the 1.5x focal factor with Fuji APS-C cameras (as opposed to the 1.6x focal factor with Canon), that 15 MM is equivalent to 22.5 MM, which is substantial on the wide end. I've never felt the need to attach a wide angle zoom while using the 15-45 - it's that good. Yes, it's a power zoom lens (extends and closes upon turning the camera on and off), but hey...it's a kit lens. One good thing is that in the case of Fuji's entry level kit lenses (which begin with the XC designation), they are pretty good with copy to copy consistency. I have two of the 15-45's and both are tack sharp from corner to corner.
Here are a few Fuji XC 15-45 F3.5-5.6 IS PZ images - taken with the X-A3, X-A5, and X-T100.
RAW, AWB, Aperture Priority mode, ISO 200, F6.3 at 1/300 sec.
RAW, AWB, Aperture Priority mode, ISO 200, F7.1 at 1/250 sec.
RAW, AWB, ISO 12,800, Aperture Priority Mode, F4.5 at 1/45 sec. Note - what looks like noise in the shadows is snow (it was snowing light that evening).
RAW, AWB, ISO 800, Manual Mode, F4.5 at 1/60 sec. External flash used was a Fuji EF-42 in bounce mode.
RAW, AWB, ISO 12,800, Aperture Priority Mode at F5.6 at 1/40th of a second. The lighting was bad aboard this steam paddler river boat in Nashville, Tenn. The show as great, but trying to capture the country/western performers as they were moving quickly was tough.
RAW, AWB, ISO 12,800, Aperture Priority Mode at F3.5 and 1/10 of a second.