1st: 2009 Cadillac CTS-V - Best performance, lowest price, most comprehensive feature content puts Cadillac atop the sport sedan pedestal.
2nd: 2009 Mercedes-Benz C63 AMG - Good things come in small packages, and the C63 uses this to its advantage, scoring within 1.6 points of the CTS-V.
3rd: 2008 BMW M5 - Once the undisputed super-sedan benchmark, the four-year-old M5 is still a great sport sedan, just not the best.
It's Academic If you're looking for the short answer, here it is; the 2009 Cadillac CTS-V is undeniably faster, more nimble and between $27,000 and $32,000 less expensive than the BMW M5 it was designed to beat. The M5's price/performance ratio really penalizes it in this comparison. Is the CTS-V really better than the C63 AMG? Well, once you look at the score cards, you'll find one 1st-place score in the M5's column (earned in our evaluation category), three 1sts for the CTS-V (features, performance and price), and two for the C63 (editors' personal and recommended picks). The winner would seem a forgone conclusion then. But have a look at the 2nd- and 3rd-place scores. The C63 snatched four 2nd-place scores to the CTS-V's three 3rds. Because of the way we weight the final scores, the Cadillac ekes out a 1.6-point margin over the Mercedes-Benz. We've declared such close scores an effective tie in the past, but the Cadillac's dominance in measured performance tests plus its uncommon comfort, comprehensive list of features and even best observed fuel economy of this trio combine to earn it our fullest endorsement as the winner of this comparison. "Sport Sedan Standard of the World" now wears a Cadillac wreath and crest.
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