This is the compression standard that makes 4K video manageable. It allows for incredible detail without requiring astronomical file sizes, preserving the "film grain" and texture of the rock.
The camera crew, all professional climbers themselves, hung from ropes to capture angles that feel impossible. In 2160p, the depth perception is enhanced, making the "void" feel much more real—and much more terrifying. Free.Solo.2018.2160p.UHD.BluRay.X265.10bit.HDR....
This provides four times the resolution of standard 1080p HD. In a film where the scale of the mountain is a character itself, 4K allows you to see the terrifying distance between Honnold’s climbing shoes and the valley floor thousands of feet below. This is the compression standard that makes 4K