https://www.cnet.com/news/sonys-first-8k-tvs-get-supersized-to-85-and-98-inches-at-ces-2019/

8K resolution promises improved detail compared to standard 4K, but at this early stage in the game there's no actual 8K TV shows and movies to take advantage of it. That's why Sony and other TV makers tout their sets' video processing, which takes 4K and lower-resolution video and converts it to 8K for display. 

Sony says the Master Series' Picture Processor X1 Ultimate "has a unique algorithm specially developed for 8K that can intelligently detect and analyze each object in the picture, resulting in exceptional detail and contrast for a more realistic picture that represents the creators' intent." It sounds a bit like the AI processing Samsung uses, and in my brief time with that technology I found it tough to see the benefit of the processing and extra resolution. We'll see how Sony compares.