One thing that i always loved about sinar is that i can buy a 30 years old norma and using it with accessories of the sinar p2 that i can buy new now...
I bought the phaseone 645 af about 1 year ago and now i can't use the new accessories on it... if i want the battery grip i have to but the DF, if i want to use the leaf shitter lenses i have to buy the DF... If you can use hasselblad, leaf, phaseone together you will find, in my point of view, that the differences about quality, color etc etc are minimal, nothing about them have told me "this is the best!" Yes, i have read about the test between hasselblad multishot and phaseone, for me this means nothing. A web test it's not a good test, i have to try a camera in my workflow. But i know one thing, these cameras are expensive, you can't buy a phaseone and a hasselblad... 15 years ago we could buy a mamiya rz67 and a hasselblad 6x6 for different task, we could buy a sinar 4x5. But now, we can buy just 1 mfdb sistem, too much money around it. So now, tell me, where is going to my investiment on phaseone if i have to spend 5500 euros for a new body just to use the new really expensive leaf lenses and a batterygrip? I'm not an engeneer, i'm a photographer, and i'm sure there is a very important problem of compatibility between the Af and the DF...