The latest App Store statistics released by Apple show that 74% of all compatible devices now boot iOS 7. The
share of the latest OS version is up 10% since October, thus
making iOS 7 the fastest adopted release to date.
In simple english, people have ported to the new Apple software faster than any other time.
The stats from the Cupertino company also show that iOS 6 runs on the
devices of 22% of all App Store users. The remaining 4%
goes to devices running older iOS versions.