"Until now this version was only available for the Nexus 5 and Nexus 7 (2013), but developers recently got it working on the Nexus 4 as well."
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TechFrag - The Android 5.1 Lollipop update was made available to only select users in March when Google announced the latest update. The update is now being rolled out to additional users of Nexus 5.
There was a battery leak issue with the 5.0 but now it seems it's resolved with the 5.1 update. I have this phone and I have got the update.
"Earlier today, an LG representative said something similar when he stated that the LG G3 flagship smartphone will receive Android Lollipop by the end of the year. The representative didn’t offer any further details so we’ll have to wait until LG makes an official announcement before we can learn the specific release date."
G3 is LG's flagship so it's obvious that it would get the lollipop treatment sooner or later.