The RS6 may be more powerful, but with over 4400lbs to propel, I doubt it will be much faster. My biggest gripes with the S6/RS6, is the engine being over the front wheels instead of pushed back as in its competitors. Its weight distribution is awefull. While the RS6 may sport more agressive body peices, I dislike the A6 shape to begin with, the rear roof line is way to long and the whole car looks very fat IMHO.