Jo, I have no problems with the Hasselblad back. It's the HC lenses I don't like. In fact some of the worst results I had were with an Aptus on Hasselblad. As for sharpening, the results with the Hassleblad lenses look bad even when blurred rather than sharpened.
Interesting, I recently saw a fashion photographer shoot an Aptus 75 on an H2 using HC lenses and a CF adapter with CFE lenses. In side by side viewing it was virtually impossible to tell them apart utilizing the same or very similar focal lengths.
In fact, most viewers selected the HC150 as the sweetest look of any of the lenses.
IMO the hype regarding HC vs. other lenses is just that.