Ultimately, the IQ in none of these HMDs is going to blow Gear VR away. Gear VR uses a 1440p screen. Of course, the PC HMDs will be able to make somewhat better use of their resolution with better optics and because they don't lose as many pixels (due to separate screens), and PSVR, though it's even lower resolution on a single screen, at least has a RGB layout.
But ultimately, I think people should get used to the idea that in terms of spatial resolution, none of the first generation consumer headsets will be particularly good. In fact, they will be a lot worse than whatever monitor or TV you are used to. The sooner you make your peace with that the better.
At least there are some aspects in which the IQ will shine compared to your existing displays, like contrast ratio (unless you are using an OLED TV).