Regarding compaatibility of MF backs with the 203FE Hasselblad, although it is not compatible with the Phase One, it is compatible with the Hasselblad backs, from the 16 meg CFV, to the 22meg 132C, 538C, 22CF and 39megg 39 CF...all of them will work.
All of them will not only work on the 203, but all of them, except the CFV—which crops top and bottom as well as left and right with its 16meg square sensor— will also give full wide angle files (left to right) with all of the Hasselblad wide lenses from the 30 Distagon to the 38 Biogon on the SWC to the 40s and 50s. Some lenses are easier to use with the Hass/Imacon backs, such as the CFE series, but they will all work on the 203FE.
Simply put, the 132C and 22CF and 39CF produces such large files that I don't like working with them, which is the main reason I got the CFV. Its files are smaller and more manageable and storable and easier to manipulate in PS. I have held on to the 132C with the ability to upgrade it ($5k for the CF22 or $10K for the CF39) because I thought I would miss the left/right wide angle view of the 132C that is not achievable with the CFV.
The reason I am interested in this thread is (1) I have the M8 and would not give up my CFV for it (2) I have used the 132C and 22CF and can confirm what they can do and that they can be used on the 200 series cameras (205TCC, 205FCC, 203FE).
I am probably going to sell the 132C, however, as I would prefer to have the smaller super high quality files of the CFV than the much large and wide angle super high quality files of the 132C, CF22 or CF39).
I am not a digital photography expert, so the following may not be accurate, but as I understand it, the reason the 16 meg sensor of the CFV is better than the 16meg sensor of the Canons iis the the pixels of the Hass/Imacon are bigger and therefore contain much more information, which translates into greater detail and dynamic range.
No Hasselblad is as quick and easy to use as the M8, however, nor as quiet, small and light as the M8. Think about it this way, the M8 is a thoroughbred (or a quarter horse) and the Hasselblad is a Percheron or a Clydesdale (how's that for a metaphor?)