Not too shabby, considering previous Android software versions took longer to propagate through the ecosystem of devices. A month after launch, Android 4.4 KitKat has already been part of upgrades for existing phones and comes with the Nexus 5, taking a 1.1% share of the pie. The previous software version, Android 4.3 Jelly Bean represents 54.5 percent of all Android use, but the growth will eventually stop with the incoming waves of 4.4 devices and updates.
And that’s a good thing.
Via: Android Developers