iOS 9 is found to be running on 57% of all the iDevices as on October 5, 2015.
Developers at Apple has shared latest statistics for the iOS 9 adoption and unlike Android, the adoption of the latest iOS version is always on the top the same month. This time also newly launched iOS 9 has pegged back to claim the highest iOS version adoption of all versions.
Of all the iDevices, there are 57% handset and tablets running iOS 9 [this includes iOS 9.0.1 and iOS 9.0.2].
The iOS 9 adoption in coming month will continue to grow as we approach a stable release by Apple in coming days.