My point is that we regularly have details when scanning at 4K that are only 1 pixel high.
Sure, but I felt is was worth noting, that the bluray with it’s digital noise reduction isn’t really a good representation of the detail, that can be resolved at 2K. I’ve used that example myself in discussions, but when examining the frames at 2K, I was surprised to see, that especially in motion, the pattern around the edge is also visible at 2K resolution. Here I’ve averaged a number of frames, which should be a better representation how it looks in motion:
Now obviously it’s pushing the limits of the detail 2K can resolve, but there’s no denying the pattern is visible.