Recommended settings: 10-bit, crf 18-20, slow preset.
Here's an example of what such a post might look like (for informational or review purposes only): Saw X (2023) – x265 encode impressions saw 10 x265
Just grabbed the x265 (HEVC) version of Saw X . Quality is solid for the file size — much better than the old x264 rips of earlier Saw films. Dark scenes (which is most of the movie) hold up well with minimal banding. Audio sync is fine on the copy I checked. Recommended settings: 10-bit, crf 18-20, slow preset