Yes, the Pimax Crystal is the next gen above the 8K. Pimax is working on the 12K, but it is at least another 2 years away. Currently the Pimax Crystal is "state of the art" in VR.
As far as Aces High is concerned just imagine the image you see on a 4K monitor rendered in VR with the same clarity and with 3D and head tracking added in.
For games like DCS, the eye tracking allows for foveated rendering so that your computer only does high res where you are looking. You don't notice any difference in your perceived visual, but your computer is getting a 35% or better performance boost.