I'm currently watching Westworld S3 on 4K blu-ray.
Technical details first: 4K HDR is a complete waste for West World. It looks pretty much exactly the same on Blu-ray. HDR is non existent and the show has a deliberate soft look making 4K kinda pointless.
As for the content, I'm not really digging this season. The questions posed are very interesting and well thought out, yet the execution makes it more confusing than it needs to be. It's a bad sign when I'm starting to enjoy the intro music more than the actual content... Another one played out.
And watching Dr. Death, the undoctored story, now that's scary stuff!