I've been with Canon since I started (400D-->7D--5DIII). I picked up the Fuji XT-1, and I really like it. I still love my 5DIII and I am not "jumping ship" on Canon; just adding a new member to the team. As to a couple of the issues I noticed people talking about above regarding the ergonomics... I agree that it isn't as easy to use as the 5DIII (although part of that is adjusting to a new camera and system), but I found the trade-offs to offset the "negatives." A few of my general "pros" and "cons" (bad news first):
-Changing the AF points--I can do this looking through the viewfinder, but the control pad is a bit more finicky than the 5DIII joystick. Also, the small size of the camera means my thumb is kind of sandwiched between my face and the camera when I try to move them around.
-All the rings and dials present lots of opportunities for unintentionally knocking something and changing the settings. In particular, I have found the aperture ring, the exposure comp dial, and the ISO dial to be vulnerable to this. On the positive side, the small size of the camera means it's pretty easy to change quickly without taking my eye away form the camera and the viewfinder kind of doubles as a "heads up display" so it's very easy to reset them. The location of these controls doesn't present the same kind of "facial interference" problems that the AF points do.
-The battery life on the XT-1 sucks. A lot of the reviews say it's good for 350 shots, but I haven't gotten that many out of it. I bought a second battery the day after I got the camera and may pick up a third. For me, having a couple extra batteries solves the problem. But for people who will be unable to frequently recharge batteries, power management might be an issue. (I'm thinking here of people who are going to be backpacking for several days; for someone out shooting for a day around a city an extra battery should be fine).
-New system for me, so obviously I don't have the variety of lenses for the Fuji that I do for the Canon
-The Fuji software is... disappointingly hard to use and non-intuitive
On the plus side:
-I'm very happy with the IQ from the XT-1. (I won't say anything about DR or ISO tests because other people have done those / will do those and frankly I don't really care. I'm plenty happy with the photographs from this camera (and I'm also plenty happy with the IQ from my 5DIII...)
-the XT-1 is a LOT easier to carry around than the 5DIII. The ergonomic issues mentioned above are more than offset for me by the size and weight advantage in many situations.
-The AF and continuous AF is really good. (Perhaps not as snappy as the 5DIII in very low light situations, but it still works... I'd held off of the earlier Fuji's (particularly the XE-2) because the AF seemed very slow to me). One caveat, I guess--I live in Japan and shoot a lot of matsuri's (festivals and folk dances), often at night. I haven't had the chance to test the continuous AF in those situations yet
-The EVF is as good as you have read; as I mentioned above, there is so much information available that I rarely need to access the Q button (I make most of my changes from the viewfinder).
-A couple new features for me are nice (certainly not exclusive to Fuji--many cameras from Canon and other companies also have them). I have never used a tilt-screen before, which makes shooting low angle a lot more comfortable. Also, the wifi link with my iPhone is pretty cool both as an always-with-me remote and as a way of sharing photos immediately.
As I said at the beginning, I still love my 5DIII and have no plans to "jump systems." But I am going to "split time" between the Canon and the Fuji--especially for a lot of my travel stuff (the Fuji is so much lighter and more convenient for traveling).
Not a technical review (lots of those out there from more knowledgeable sources), but for what it's worth this has been my experience with the XT-1.