Orange peel, color and metalic pigment distribution and oriantation...that's all is a big issue if you're running efficient and ecologic paint process. BMW is investing a lot into color and appearance measuring/adjusting, much more then common european brands. Know this very well, cos it's my job.
Unfortunately, to be first in new technology doesn't mean to have great results at the same time.
If I compare my F20 to Lexus IS250 ('06) that I had before, it's a huge difference in appearance too.