it feels a bit quicker due to less weight and more torque. amenities in the is-f far surpass the rs4 (backup cam, aux in jack, touchscreen nav). auto tranny is also nice as i live in an area with a lot of traffic. plus, i've found a lot of audi owners to be elitists and that drives me crazy. i've owned vehicles from many different manufacturers and appreciate good cars no matter who it's from. a number of audi people think there's no other car worth owning and i don't agree...at all. hopefully the lexus crowd is a little better. doubtful i'll own another audi.
oh yeah, 75k for a rs4 and they don't even give you a damn cargo net