Thank you everybody for your contribution: in the end I have ordered a mint Hasselblad XPan +45mm lens on eBay and I am looking forward to get it and insert the first roll!!

But now other two questions came to my mind
- Since the lens is relatively slow, would you suggest 400 iso film for street photography, or can one "dare" to use a 100 iso film?
- I am thinking of buying the 90mm lens as well for "unusual" portrait photography with panoramic format: do you also have such lens, and how much do you use it in comparison with the 45mm?

As usual, thanks for the feedback!