Looks pretty nice, and it seems you get a lot for 11,500.
If I went to an S4, I wouldnt do this though. I'd do some nice P4xsc Wheel.
Isn't this body S4 near the end of its life cycle as well? I wouldn't buy a small fast saloon now, wait a year or so.
Anyway, vs a B/O M3 this will still lose. It may match a stock M3 though.