After offering a teaser last week, Jaguar unleashed its fastest sedan ever on the L.A. Auto Show floor about an hour ago. The four-door XFR-S is powered by a 5.0-liter, 550hp V8 that gets to 60 in 4.4 seconds. Jaguar is using an upgraded suspension in the front and rear, bumping lateral stiffness by around 30 percent. Even tha humongous rear bumper is there a reason, helping to subdue lift up to 68 percent more. Would you take this or the F-Type?