Corvette Stingray, Porsche 918 Spyder among best luxury cars of 2013

Automakers are releasing new and significantly revised cars at an absolutely frantic pace. Most of them are, amazingly, quite good. A few are even better than that, managing to define, change or recharge a segment. These are the picks of Jason Harper, Bloomberg News's auto reviewer, for the best autos of 2013.

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