The CF120 is optimized for close range and is not flat field at infinity. The HC-lenses are more modern designs with more uniform field performance. If you need excellent performance at infinity the Sonnar 150/4 is stellar. Hasselblad also has a 100/3.5 planar that is truly excellent.
The CF has flat field close up but curved field at infinity on P45+.
Check images below shot on a 120/4CF yesterday.http://echophoto.dnsalias.net/ekr/Articles/MFDJourney/Samples/Castle2/20130624-CF043171.jpghttp://echophoto.dnsalias.net/ekr/Articles/MFDJourney/Samples/Castle2/20130624-CF043185.jpg
Raw images here: http://echophoto.dnsalias.net/ekr/Articles/MFDJourney/Samples/Castle2/RawImages/
Check this article: http://echophoto.dnsalias.net/ekr/index.php/photoarticles/74-zeiss-macro-planar-120-on-sony-alpha-99-with-an-arax-tilt-adapter
Here you find MTF data: http://www.hasselbladhistorical.eu/HW/HWLds.aspx
had anybody some experience with the Hasselblad HC 120mm and (!) the one old CF120mm macro lenses if you use a CF Adapter on the H-system? Is the sharpness ok?