I haven’t tried an Index, so I can’t compare. The lines and targets in space are clear on the 8KX.
The main advantage of the Pimax headsets is the large field of view (FOV). Unfortunately, I currently must compromise on the FOV, since I only have an RTX 2080, which doesn’t have enough graphics power to let me use high res (super sampling) and a large FOV. I really want to buy a better card, like a 3080, but they simply are not available at this time (for a reasonable price). I’m not going to pay a scalper double the list price, so I am forced to wait. 