Anybody still on KitKat?

Hi there everybody,

I just want to know if there's anybody still running KitKat and if yes, what the reason is for doing so.

I'm on Marshmallow preview 3 right now. I got the Nexus 5 a while after Lollipop was released and I never used KitKat on the N5. I would like to know if the performance/stability/battery life is any better on KitKat compared to Lollipop and Marshmallow.

Thanks in advance.