Does anyone know a place where one could RENT a Hasselblad lens to try it before buying it?
Calumet has rentals of Hasselblad equipment at their various locations.

Not sure if you have a Calumet close by, but if not, and you need to rent remotely, I think EP Levine has Hasselblad rentals (Boston) and Samy's (L.A.) does too, as I recall.