In that case I must be the only one not affected.

I have both a Jolla 1 and an Xperia X. I use the Jolla as my daily phone since the X is a bit too large to be convenient but I have recently (like about a week ago) started using the X after my old Android tablet died and I had a game in progress So my X has an Android support installed (I do not use it for anything else anyway) whilst I would never allow it to touch my Jolla.

After your message and the responses, I started paying close attention to the battery drain situation. The verdict: on neither the Jolla nor the X have I noticed any change at all after the OS upgrade. Unplugging both of them fully charged at 22:00 and checking again at 05:30 the next morning, the Jolla is at 88-92% and the X at 100%, like it has always been.

What I have noticed is an awful battery drain on the X while playing the game. Each minute takes the battery down by about 1%. But that was the case on my old Android tablet too and is not specific to Xperia X or SFOS.