I've looked at the G6 but the phone in general, non removeable battery plus price has made me wait to see what the V30 offers. If the V30 doesn't meet my needs then I will buy a discounted V20 to replace my G4.
I'll wait for the V30 too. I get the impression that LG is splitting their flagship phone market. The G series becomes the mass market phone. This makes some of the decisions around features left out of the G6 a bit more sensible. Then the V30 comes out as the enthusiast phone with all the bells and whistles. We'll just have to wait and see.