The LG G3 has been running Android 5.0 Lollipop for quite a while now, but so far the same hasn't been true for the G3 S. This is the midrange handset that looks like the G3, but comes with lesser specs. It's probably the closest thing to a G3 Mini, as it were.
And apparently LG hasn't forgotten about the G3 S on the software front. The Korean company has started pushing the Lollipop update to G3 S units, at least in Hungary.
Since the new software is already out in Hungary, it might make it to other European countries very soon. After applying the update, the G3 S runs Android 5.0.2 Lollipop, and software version V20a.
Since Android 5.0 is only now making its way to the G3 S, it's still unclear when (or if) this device will receive the update to Android 5.1, or LG's newest UI overlay on top of Google's OS.