never had a G7 but an acer VA panel, OLED is unbeatable to watch movies or tv shows, the black is unbeatable too, the motion in fast games was way better on oled too, this is currently the ultimate monitor you can buy I cannot tell you about HDR because I never had an HDR VA monitor and I dislike it as it messes with my own color tuning so I never use it
I have to point something tough I can have 240fps 1440p is not cheap to run, I mean temperature wise not only from the monitor but the PC too it's something reviews don't talk about but very noticeable when like me you go from 120Hz 1080p to 240Hz 1440p your cpu and gpu are going to sweat and you too