I just got one yesterday morning and some lenses this morning. I found the body in Seattle late on Saturday and was amazed they were able to get it to the Post Office in time for it to go out Priority Mail on Saturday, but it got here early Monday. And I'm within one day of B&H using UPS ground, so I ordered the lenses and extra batteries yesterday and got 'em this morning...
I have the 14 and 18, which I owned before with an X-Pro and XE1, and the 23mm, which I'd never used.
The camera body is pretty nice. Solid feeling about the size of the XE1/2 but with the extra height from the hump. The EVF is about as good as everyone is saying, about the same as the one in the EM1, which I also have. AF seems faster than any other Fuji I've used, but I've just been messing around with it, so I can't say definitively. Not as fast as the current m43 AF, but not far off - much better than I remember. Haven't done anything difficult with it to judge accuracy yet and haven't tried face detection or tracking AF yet. The shutter sound is kind of a two-step sound that may be the same as other Fuji bodies - I don't recall. But it caught me short the first few times I tried it - it makes it feel sort of slow, but that's an illusion because the exposure clearly happens right away and the rest of the sound is no doubt the shutter resetting itself or something.
Focus peaking is better than I remember from the X100s I shot with for a while, three colors and two levels each is much nicer than the faint white that was the only option with the X100s. The split prism focussing is nice and, when zoomed in, pretty precise. I've played around with the separate focus box but I frankly doubt I'll use it - it just makes everything too small and I find it easier to just use the center area for either peaking or split prism and then magnify it when I want to.
I really like having both a good EVF and a flip up rear screen - that was probably the combination that most made me choose this over the XE2. One little niggle though - you can leave the eye-sensor on, but it's a little sensitive if you're shooting from the belly or waist and unless you hold the camera a few inches in front of you, the screen will turn off and switch the view to the EVF. You can over-ride that using the little switch on the side of the EVF hump, but you can't set it to just toggle between the EVF and screen. One push will switch you out of eye sensor to the LCD only, the next will take you to EVF only, and then the third will turn the eye sensor back on again before the fourth starts the cycle again. Most cameras with this feature allow you to just turn the eye sensor off and just use the switch as a toggle, but this requires extra steps. The best solution I've seen to this is the EM1 which automatically disables the eye-sensor when the lcd is flipped up so you can't accidentally switch the view by holding it too close. Then when you close the screen, the eye sensor is automatically enabled again.
The back buttons, particularly the four way controller, are a bit fiddly as others have reported. It doesn't bother me much, but it might bother folks with meatier fingers. But I LOVE the number of programmable buttons. Only having one function button and the Q button on previous models always seemed like an unnecessary limitation - this one's got programmable buttons everywhere. Not to mention all of the external switches and dials. I won't use a lot of them, but they're in the right places... I kind of miss the threaded shutter button - I love using a soft release - but it's not a big deal and I can alway stick an adhesive backed soft release on it if I choose.
One comment on the lenses - the early runs of the 14 had really horribly loose aperture rings. You could just about turn it by blowing on it. The new lens isn't exactly the firmest action I've ever felt, but it's much better than before. Pretty useable actually. The 18 is a little stiffer and grittier than I remember from previous copies. And the 23's aperture ring is just about perfect feeling. I've had an RX1 for a while and that was my gold standard for fit and finish and the feel of the controls. This body, particularly with the 23mm lens, pretty much equals that and no other Fuji I'd used before came this close. The only thing that's not quite there is the exposure comp dial, which is really so stiff it requires a finger to assist the thumb. Not a terrible thing, but quite the perfect sweet spot the RX1 seemed to hit. But certainly better than some previous Fujis where they were too easy to accidentally turn - that will NOT happen with this!
Anyway, pretty favorably impressed. Nice to be back in the Fuji world after having de-emphasized it for a while and been altogether out of it for a while too. Now it's front and center again. The bodies are even better and there are more good lenses to choose from...
-Ray