No matter how much power, the larger and heavier the vehicle, the less sporting it will be to drive. I don't think it is as simple as adding hp.
Although not exactly comparable, I just finished driving a Pontiac GTO, 350 hp, 3700 lbs. Feels clumsy despite the fact that it is faster than an xfire in a straight line.

However, the Audi does look very nice, sure it is a wonderful car.