I really think so. The 599, which i foolishly bought, is really overpriced. the 458 is faster around the corners. At the limits the 599 understeers like nothing else, even after i invested some time into tuning.
I don't know, I did a 3:22.999 with the 599 cutting everything, and that's damn good in my book. Haven't tried grinding the 458 for fast times yet.