The Zunchi (BS6) car was developed and marketed in China before the BMW-Brilliance partenership so there wasn't no german input whatsoever regarding this design. Later, in 2003, there were maybe some input regarding other aspects. The design is much better than any BMW I know. BMW should learn something from Brilliance is this matter, not the other way around.
The compartion proposed here and the assumptions made are clearly old-fashioned China bashing. If BS6 is similar to the Hyunday Sonata every other sedan is. The only similarity is the size wich is pretty standard for this class of sedans. So please stop this nonsense.