Anybody here who own both a Contax 645 and a Hasselblad (any model), which one do you prefer shooting with more? Does one camera get preference over the other due to any particular unique characteristics (like the rendering from respective Zeiss lenses), square format or some such reason? Is one more convenient or reliable than the other? Any particular reason to have both? How do they compare overall in terms of image quality, even though both cameras sport Zeiss lenses? Just curious.