I had a new '09 G37S before my 335is. It was my first car. Never any speeding tickets or problems though. I didn't drive like a D-bag.
Interestingly enough, most G drivers feel as if BMW drivers are all assholes. And in my G, not going to lie, every time a 335i/135i came up next to me, they always revved their engines and laughed that I had a G37S. Obviously the 335i is more expensive and faster, which I why I moved to one in the first place. But to be honest, I mostly see older people in the G37 sedans, and have yet to run into any problems with anyone in a G.