Thanks!
Although some scenes would have unnatural colors, we are talking about a film, so… if you think about it, maybe 90% of action Hollywood movies released in the latest years have some (or all) of them!
According to my (brief) tests, it seems to work well, but I should watch the whole movie (still encoding) - even if, to be honest, after few minutes the brain “set up” the white point, so it will say to my eyes it is OK, even if it’s not… 😄
70mm cells: I took your picture as inspiration because, reading what you wrote about, it should look like a lot close as it is when watched live; but don’t know about those other cells, tough… pretty sure they were scanned without too much care, so can’t be trusted as color reference, unless the scanner have done a good job like you, and wrote about it!
Nevertheless, it would be nice to have a look at them, and maybe discover that they match your 70mm one!