I recently acquired one of the Ver 1 Hasselblad CFV backs for use with a 500 C/M. Not the latest technology, of course, but I get a kick out of working with the Hassy and framing in square format, and as old as it is, the CFV still seems to produce less noise in shadow areas that my Canon 1DsIII. Still, looking for greener grass, I wondered whether a Phase 20+ might be a a significant enough step up in image quality to warrant looking into a trade up. Since the two backs use the same or similar Kodak chips, so I am guessing there wouldn't be that much difference. However, I note that the Phase back can shoot for up to an hour, whereas the CFV is limited to a few minutes. This suggests that Phase has developed better ways to deal with low light situations. CFV native raw files contain a fair amount of color speckles in shadow areas at shutter speeds of 1s or more; for some reason Hasselblad chose to deal with these in software (Phocus) rather than by shooting an extra dark frame as do Canon and, I gather, Phase backs. That seems like a superior solution. Would I have anything else to gain with a P20+? Would greatly appreciate advice from those who might have experience with both systems. Thanks in advance, Chris