Greetings,(posted 8619 days ago)You may get more responses to this question if you post it on the Medium Format Discussion, but I'll give you my impressions of the Hassy 150. I have an older 150c and while I've never run any kind of test on it (don't need to) it is a sharp lens. The particular lens I have doesn't have the latest and greatest coatings (I think it's single coated, but not sure) so it can exhibit some loss of contrast and flare. I have used the lens in front of extension tubes for macro work and it's very sharp. If you have the older lens, just make sure you use a lens hood and avoid the type of lighting that will reduce contrast. I think this is the only reason someone might say this lens is soft.
Regards,