Here another link I found. Not the article but a thrad/poll from BMW owners.
Stated in the thread:
" just recently left iPhone and went for the Samsung Galaxy S2. Feeling all smug thinking it was 'superior in every way' n all that but it's utter shite, not sure if it's the phone or the operating system but needless to say I'll be getting rid soon and going back to iPhone. Can't beat iPhone, no matter what all the phone snobbery says"
Other smart phones (probably windows and android): 31%