Apple has published data on the penetration of iOS 6 on its mobile devices. According to the figures, the level of fragmentation of the platform is extremely low. 

93% of users use iOS 6, 5% – iOS 5, less than 1% older versions of the platform. The data is relevant for a time period of 14 days ending on June 3. 

For comparison, only 33% of Google OS users use the latest version of Android.

Sources: through