Get some gummi plfedge (I think I spelt that correctly!) and put on the rubber door seals. (Don't put any silicon products on there and ensure you don't get any polish on the door seals or the bodywork that it touches)
I had the same issue on my F10 and this has solved it.
Agree its very frustrating and because the cars are so quiet, its more noticeable.
http://www.bmw.de/de/topics/service-...oryId=213.html