at this print size the difference between 22MP MFD and the D3x is much bigger than the difference between 39MP MFD and 22MP MFD.
Yes, but I actually found going from 25 (22MP) to 45(39MP) brought me a LOT more than the Kodak (16MP) to 25 (22MP).
Althought hasselblad is certain a great system, as are all, I wonder why the over interest in the 28? In circumstances where I needed more view, stitch brings so much more flexibility.
Thus, a Phase (or Leaf or Sinar) back and a Contax or Phamyia body would seem to allow much more flexibility. In fact I would concentrate on
back Resolution
GLASS
and then body.
Both Contax and PM with get you AF, and both take all the Hasselblad V glass. The 45+ or 40+ is where you may find the sweet spot for resolution, and then with Contax or Phase you will have more options.
I hate to say it, but at current prices (an 45mm Contax under $500!) the C645 is almost a 'disposable system' from your point of view. On the other hand, with a Phase body you have the promise of Schneider Kreutznach glass on the horizon (and here!)
If you want to migrate or extend to view camera, the C and PM are much easier.
BTW, have you had a chance to TRY any of this stuff? Tools are very personal things as you will hear many of the folk here say.
In any case, you will have (even with HB) a terrific step up from 35mm DSLR and then you can concentrate on image making.
Regards
Victor