Is Chipotle Worth Its Premium Price Tag Relative to Rivals?

Chipotle Mexican Grill (CMG) trades at 28.7 times its past year's earnings, the second-highest price-to-earnings ratio among six large restaurant chains. A price that high makes sense only if Chipotle grows faster or earns more than the chains priced below it. So does Chipotle deliver enough to be worth more than its rivals.