Much of what I upload on Wallhaven is in-game content which has been modified in many ways. There is no chance you could play any game these days with an 11k output. A typical example is any 11k image I've uploaded on here was done using just a GTX 1080 TI graphics card. You are looking at an 11Gb graphics card to produce an 11k image output! Which doesn't come cheap.
Enjoy these 11k renders, I normally take 3 each time, just to get one really good one. This is what is known as cinematic images, at a very high level of detail. The images I produce will be mostly from NFS, but I have a lot of Forza Horizon 4 images that have also used advanced rendering techniques.
I am working on a complete city in 3D. Obviously, images taken of it will be 4k, it is a huge project. Unique futuristic cars, cyborgs, and streets patrolled by heavy complex machinery. Buildings can be entered, each one being unique, glass, concrete, marble, mirrored glass and much more. I will upload part's as I get further into the project.