I've read at least 10 reviews in the past two days -- almost all of them favorable -- though most belittle the G4 for not having wireless or QC. However, none of them bothered (well, Phonearena did but their testing was skewed) how long the G4's 1.8A charger takes to go from 0% to 100%, or 50-60% to 100%. I don't expect it to be the 87 minutes the S6 takes, but if it's 30 minutes longer, hey, that's not so bad either. It doesn't have to be an official QC to be pretty darn good.
Hopefully, one of the AC editors with a G4 can chime in on this...