Road&Track just release their review on IS-F.
"The 8-speed transmission helps the IS F achieve its remarkably quick acceleration numbers: 0–60 mph in just 4.4 seconds and the quarter mile in 12.8 sec. at 113.3 mph."
"Its 71.2-mph slalom speed is damn impressive for such a heavy sedan (3825 lb.), eclipsing not only the Audi RS 4 (68.9 mph) but also the Porsche Cayman S (70.6 mph). The 911 Carrera 4S barely edges the Lexus, at 71.5 mph. "
http://www.roadandtrack.com/article....rticle_id=6177
I would still choose E92 M3 over IS-F. But still an impressive car.