I have a 503 CW with Phase One P20
works fine, But I 've noticed that one 503 is not the other
sometimes you focus the image in the viewfinder and think its sharp, then on the CCD it's not ! On another 503 I do not have this problem
I recall that hasselblad use to have fine "slices" of frames to put between your body and MFDB, to adjust the precise focus
On film, this is not an issue, but a CCD is more sensible to the correct focus
so be ware !
otherwise nice results, the lenses are top, and prove to be perfectly suitable for digital too
I work out of hand, sometimes at 1/15 sec, but I always use the mirror lock-up first
I did weddings, street candids in available light
ISO is not that of an issue since you can easily correct a lot in C1
You have to UNDER expose -2 stops in comparison with film to get the same results
I found the Sinar e75 better than my P20 or even P45, for skin tones, lips colour and accuracy in general.
I would by the sinar, when you change your camera, you just have to buy another adapter for it, Phase does not do this, you have buy another back or exchange it