I went to see the new Phase XF today. It is a solid, well constructed improvement on the previous Mamiya, and wih it one finally gets the impression that lens, back and body have been melded into an integrated set and not assembled from different kits. This really is a Phase camera, not a Phamiya FrankenMaschine. The top body display panel is clean and well legible by my middle aged eyes, the controls wheels are crisp, although they don't really stand out enough for my fat fingers. Diopter adjustment on the prism display is easy, and with my glasses the viewfinder @ F2.8 is nice and sharp, with an outline marked for the crop. In summary, all the camera controls are integrated and well located.
As I expected, focus may be the weak point of the new body at least in office-level light. When I tried a portrait, the focus hunted a bit. There is none of the low-light snapiness of a modern dSLR. Also I focused as best I could on the front eye, @F3.2, and got the back eye in focus on a 3/4 profile shot with the 80 @ 1.5/2 m. I did repeat this test, with the same results; maybe I don't know how to focus, maybe the lens adjustment was off, maybe the AF went for the much brighter and higher contrast eyeball which was by the window. I wouldn't know which, but I certainly wouldn't use this camera under F5.6 without extensive testing.
The Gentleman from Phase to who I spoke (Esben?) told me that this camera has a color sensor surface rather than individual AF points, and that Phase's idea is to make focus "just work" for pros, rather than have the multiple focus points of an SLR. I don't really understand what is meant by that, but then I think we all agree with Synn that I'm not the sharpest knife in the box. My feeling is that the focus system is still a work in progress, and that every user should test that the focus is appropriate to their use.
I tried the chimney fold-down waist-level finder, and it worked as well as can be expected,. I'm a bit nostalgic for the Hasselblad experience, but this is a modern sub-645 camera without the large bright 6x6 image I so nostagically remember - did it really exist? IMHO a rigid vertical enlarged loupe finder might make more sense, especially for repro. But if you're desperate for a WLF it is there, as advertised, with metering.
On balance, my impression is that if you are a user of the Phamiya, and like Phase backs and Schneider optics, then you will love the new FX. It is faster to focus, has less mirror slap, feels much more solid, has a large, pleasant and clean non-distorting finder, speed and aperture displays that middle aged eyes can read even in average light, customisable controls, and has been designed from the start to integrate well physically and logically with the superb Phase backs. The XF is a quality product, specifically designed for the needs of the existing customerbase; it has a COPAL shutter rated at 350K shots, a record in my book, and I believe that Phase will make good on their clear intent to make a tool that is totally reliable, while providing the best possible files available from an MF camera. However if you want an MF camera that is reactive or nearer in ergonomics to a dSLR, then you might still well prefer Hasselblad's TrueFocus H series or Leica's S model, or even the cheap but very modern Pentax.
Edmund