It's better than the standard one they used to fit in the 4-cyl e46 and e90; but not as good as the ones they used to fit in the 6-cyl e39 and e60. I know as I owned all of the above!
For example, in my early 2012 f10 520d M-Sport there are no tweeters near the door mirrors; whereas my old e60 525d M-Sport did, as well as having subwoofers under the front seats... It wasn't as good as a B&O/Bose type set up, but much richer and fuller sounding then what I have now.
I think you'll find the basic system lacking...
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