The quick adoption of the Apple iPhone 5s would seem to indicate that buyers of the device are happy with the new features. Happy enough to update before their current two-year pact expires. Could Touch ID, or the 64 bit A7, or the improvements to the camera be driving demand for the Apple iPhone 5s, or is it simply a case of iPhone buyers wanting the latest and greatest model out of Cupertino regardless of where they stand on the upgrade cycle?
Considering the slower adoption rate for the Apple iPhone 5c, it seems that there is no rush in picking up that model and potential buyers of the device are waiting for their upgrade to kick-in before buying the phone.
The Apple iPhone 5s is being adopted three times as fast as the Apple iPhone 5c
source: Mixpanel via TechCrunch