Two of the hottest currently available sports sedans are the Audi RS4 and the Lexus IS-F, both of which attack quite the premium market. The two cars are pitted directly against one another in this InsideLine video. They run them through a series of tests, like the skidpad, slalom, 0-60, and the quarter mile. The 416hp Lexus IS-F is a beefier version of the standard IS, just as the RS4 is a hopped version of the A4. Which car comes out on top?