After these it should be obvious that the bokeh of the 180/2,8 is outstanding ;-)
However, then there is the problem of chosing a camera. Though I know the East German 35mm cameras quite well, I do not have any real experience with the Eastern Bloc MF cameras. There is Pentacon Six, Kiev 6, Kiev 88 CM(!) (Only the CM version will take the P6 lenses!).
These lenses were also available for Mamiya 645 and Rolleiflex SL66 in very small numbers. One needs a good amount of luck to find them nowadays.
To come back to Vegeottos original question: Yes, these lenses are very good optically, but they are not better than their Rollei/Hasselblad counterparts. They are not worse either + they are usually one stop faster, and I think it is the last point that sets them apart, more than any other optical property.