unfortunately H have success. more than the others in the market, as i believe.
Rainer, this might sound crazy but I believe many pros aren't capable or don't have the time to really judge all the systems for themselves. They will just go with the platform which is making the most noise and which they see others use. There will always be a portion of any market which follows the trends blindly.
If I were competing with Hasselblad, I would match their marketing exposure, and make sure the competing camera was seen in the hands of well-known professionals, and I would make sure that the camera was available in rental outfits wherever the Hasselblad is available, etc.
Time and time again I see people here basing their purchase on the basis of there being only one product available from a local dealer.
There are many factors other than product quality which can lead to sales.