I had an IS-250 which is the same body as the IS-F. The car has very thick A, B, & C pillars which created many blind spots for me. I could never rely on my mirrors and always had to turn my head when changing lanes. The front seats seem to be very thick which makes it seem smaller in the rear than the M. As good as the 2012 IS-f is it makes me wonder just how much better the new M3 is going to be. BMW always seems to be a step ahead.
The paint job is about the best I've seen on any car, it's just amazing.