Big luxury sedans aren't usually the fastest things in the world. But they also don't usually have AMG-made V12 engines powering them. The 2006 S65 AMG is all about both having and eating one's cake. This is the car for the person who wants a limo with sports car performance and handling that seems totally at odds with the sheer size of the S-class. While the whole of the W221 S-class lineup is brilliant, we just had to single out the S65 for being surprisingly brilliant.