Correct me if I'm wrong, but is the Hartblei 4/40 IF TS ( http://www.hartblei.de/en/sr40if.htm ) this Hasselblad lens,
http://www.zeiss.com/C12567A8003B8B6F/EmbedTitelIntern/Distagon4_40mm_IF_CFE_104966_e/$File/Distagon4_40mm_IF_CFE_104966_e.pdf
If so the MTF looks pretty good and it would make a good addition to 35mm format. The other Hartblei lenses don't look so good by comparison.
Dan

All the Hasselblad lenses are fine lenses, the zeiss retrofocus lenses just have the extra notch of having great center sharpness wide open, while the others need to stop down an extra stop or two