I have read it and explored the making of those films and the cameras used. I thank you for the info on those movies very much. I never knew that some scenes were shot in 4k but changed during the process from 4 to 2k which I must admit was a bit over my head in making the final product. The process for the Hobbit was a tad bit different in that the Red camera didn't have a 3D component so they chose another over my head process for 3D.
After reading more on the info you provided, I was stunned by the whole process of the whole eh sausage making lol.
I asked in another place a 3D forum and here are some answers:
Is there a 3D movie shot in 4K?
www.avsforum.com
"Most likely 8k cameras and down-converted for 3D commercial use. bluray is all 1080p now. I believe some theaters have 4k 3D setups using Left and Right eye videos. Look it up online. You'll get more info about it".
"Only digitally if you have the Apple Vision Pro, I believe The Hobbit movies and Avatar: The Way of Water are available in 4K with HFR as well".
"Technically yes".
I guess, I will ask is there a 3D movie shot in 4k that one can buy lol