I, unfortunately, had two separate bad experiences with Fuji AF 645s and i would say these cameras are anything but "dependable," with "accurate...focus."
I bought a 'used' GA645zi a few years ago. I shot a casual test roll. I was mainly checking the meter, and the lens' sharpness. I wasn't entirely thrilled with the results, but i wasn't being very critical, as i wasn't testing it with any critical procedure - i just walked around and snapped with it. So, i then took the camera to south america on a two week vacation. When i returned, i was saddened to find that film looked okay, but scanning showed that the images weren't really in focus. I looked back at the earlier test roll and found that the images at nearer distances and at wider apertures were problematic. Because, though, there were enough shots on that roll at moderate distances and/or at smaller apertures, my overall 'assessment' didn't really reveal a problem. With the issues on the travel pictures evident, i sent the camera to Fuji for inspection. They informed me that the camera's AF module needed to be calibrated. They fixed it at a reasonable cost, but i sold the camera shortly thereafter. In addition to the lost confidence, i didn't really like the zoom at the expense of lens 'speed.'
So, a few years later/a few months ago, i bought a used GA645i, based on the wonderful net/forum comments. This time, i checked the test roll with the previous experience in mind. This camera has similar problems. I sent it to Fuji, again, thinking i could just have the AF calibrated, and then i'd be satisfied with it. Fuji, though, said the AF module, as well as the main power circuit board needed to be replaced entirely. That procedure was estimated to cost $700 or so (if i recall) - more than i paid for the camera itself.... I declined and returned it to the seller after a bit of a brouhaha.
So, i guess my point is this:
If you go forward with it, TEST IT. And, look critically at the film, then make scans/prints. Shoot it at the widest apertures, at various distances. Make sure the AF is accurate. If it isn't, make sure it's an easy fix. But, then, consider that even if you are initially happy, that may not last forever. As much as i did like the non-zoom version, even if i could get one that worked, i don't think i'd ever really TRUST it. I bought it for travel photography. I would forever be paranoid that the camera would become 'un-calibrated' somehow. Maybe through just the plane vibrations during a 13 hour flight -who knows.... With an AF 'rangefinder,' you cannot tell if the thing is working. Even when you're conscious to pay attention to the distance readout in the viewfinder, you just don't know. I recall looking at the distance constantly - to be sure - but... that means you're distracted from the other things you're supposed to be thinking of while shooting, and 2) in my experience, the distance still seemed Right - if you're shooting something 2.5m away and the thing says it's focused on something 3m away, are you going to question it? In my usage, the AF wasn't THAT far off. Just enough to make everything soft somehow.....
So, i got a Bronica RF645 to replace the GA645. It's solid. It's roughly the same size as the Fuji. The lens(es) are sharp, with good bokeh. It's manual focus and wind so it's a bit slower in operation, but i feel like i know that it's doing what i expect. I suppose the rangefinder could go out of calibration, but just like with the M7 or Zeiss Ikon, that's not something i feel is very likely. When i got it, the vertical alignment was already slightly off and the images were still sharp. Got that fixed under warranty, and i'm happy.
