It used to be the fragmentation was one of the key disadvantages of Android. What this meant is that the latest version of Android could have been released, but due to carrier or OEM delays you might only receive it several months after. Sometimes your friend with the same phone on a different carrier could receive it weeks before you do as well.
However Google has been hard at work combating fragmentation and it shows. According to the latest Android distribution figures, it has shown that in September 2015, Android 5.x Lollipop has climbed to 21% of all Android versions. This is a 2.9% increase from last month, and an 8.6% leap from June 2015.
All of this just goes to show that the rate of adoption of Android 5.x Lollipop is moving along rather nicely. Granted it doesn’t have the same level of adoption compared to iOS which according to the latest figures has placed it at 87%, but it’s still pretty fast and has shown a relatively smooth growth in the past few months.
Naturally with Android 5.x Lollipop starting to account for more Android devices, this means that older versions are on the decline. Android 4.4 KitKat has dipped by 0.1%, while Android Jelly Bean has dropped from 33.6% to 31.8%. Android 4.0 Ice Cream Sandwich has also declined by 0.4%. Not particularly huge shifts, but all of which are pointing towards Lollipop gaining more market share.