Stats show that the Apple iPhone 5c is driving buyers to the Apple iPhone 5s

"The design update worked for Apple, since the would-be mid-priced [iPhone] 5 customers seem to have migrated to the higher priced flagship 5s. The jury is out on how successful the 5c was in attracting new customers, but we do know that Apple increased the average selling price of iPhones overall."-Josh Lowitz, CIRP
CIRP analyst Josh Lowitz pointed out that since the average price of iPhones purchased in 2013 rose, Apple's strategy worked. And when asked a hypothetical question about what would have happened had Apple kept the iPhone 5 as its midrange model Lowitz concludes that it would have outsold the iPhone 5c since midrange legacy Apple iPhones have historically sold well. All in all, the stats all seem to have the same conclusion, which is that the Apple iPhone 5c has forced buyers to move up to the Apple iPhone 5s.
source: re/code via BGR