That sounds interesting, I too am curious to find out more about this.
Something a notice from the Hasselblad site that might not make much of a difference is that the HC 50 f/3.5 has focusing range starting at 0.6m, while the zoom starts at 0.7m.
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I tried them both out today for an hour and I was prepared for all the bad thing I heard about the zoom... Slow AF, extremely heavy, if pointed down the zoom ring moves because of the weight...
I had absolutely no problem with the weight compared to the prime.
The AF-speed was NO problem at all. I was prepared for something like the slow (but beautiful) Canon EF 85/1,2 Mk I. Its possible that the difference is quite obvious when going from far-far-away to close, but thats not how I work anyhow.
When pointing down, the zoom didnt move at all. Maybe it will if I mounted it for a days shoot straight down or something, but... Thats not in my kind of work either.
But I didnt make any final decision today, but I think that what finally matters is how the zooms DOF at 80/max aperture looks like compared to the classic HC 80/2.8 at 2.8. If the zoom gives me a DOF that makes both the eye and the nosetip sharp, then its a no-thank-you...