Lollipop on a quarter of phones
Not as fragmented as you think
Android is famously fragmented but it appears that the problem might not be as bad as claimed.
Lollipop take up sucks
KitKat doing well
Even though Google announced Lollipop back in mid-October its take up has been slower than an Italian politician to resign after being discovered to have been embezzling millions.
KitKat has more than a fifth of Android users

Thanks to new phones
Android KitKat gains over four points in June

Jelly Bean still on over 56 percent of devices
Android 4.4 KitKat now available for international LG G2
A lot of improvements
Asus announces KitKat update schedule for PadFone lineup

Brings the Asus Zen UI as well
Android 4.4 Kitkat update rolling to Galaxy S4

Coming first to Exynos-based GT-I9500
Samsung releases Android 4.4 Kitkat update list

Samsung Galaxy S III conspicuously absent
HTC One Max and One Mini getting Android 4.4 KitKat

Should be rolling out today
Jelly Bean and KitKat now on 62.5% Android devices

Gingerbread finally sputtering out