Inside Line sets out to find the ultimate 2008 V8 luxury sports sedan by comparing the 2008 Audi A6 4.2, 2008 BMW 550i, 2009 Jaguar XF Supercharged and 2008 Mercedes-Benz E550. Video after the break. Click here for first picture in gallery.

At this level of price and performance, the differences between luxury sedans get harder and harder to define. They’re only tenths apart at the track and a few decibels away from each other on the freeway.

[via Edmunds]