I have a nexus 10 with lollipop 5.11 so I know vanilla android. Lg did a very decent job with the interface on the g3. All I need to do is turn off some "features" and it's nearly perfect. I expect no less from the g4.
Not the vanilla Android more the subtle add one moto gives it. Active display, and those slight moto features are so amazing.
Posted on my Moto X that is prob being charged as we speak...