The number of M Sports is clearly skewed by the "enthusiast" nature of the forums. I've never seen an F30 M Sport on the road (all 328s - a handful of sport lines and all the rest have been base, luxury, and even a couple modern lines). When I took mine in to the dealer ( I didn't buy from them) for service, they were excited because it was the first M Sport F30 they had seen in person and only the second F30 335i to go through there.
08/20/12 Euro Delivery (Re-delivered in U.S. 09/29/12): 2013 335i M Sport
| 6MT | Alpine White | Coral Red | Tech | Cold Weather | Dynamic Handling | Rearview Camera | Park Distance Control | M Perf. Power Kit | M Perf. Brakes (red) | M Perf. Exhaust | M Perf. grilles | H&R Sport springs | 19" AG M510s | BMS clutch stop | Matched reflectors