I like the look of the M3 more than the generic E92, but it was out of my budget range when I bought my 335. I added M3 side skirts to my car because I think the more aggressive lines look cooler.
I don't personally care what others do with their cars. I happen to prefer the M3 look, but I am not doing a full conversion or anything. I'll just buy an M3 next time I'm trading in