While we're at it, let's run a plot of the SSIM score of both 4 minute encodes.
https://en.wikipedia.org/wiki/Structural_similarity

Somewhat surprisingly the SSIM score of the unrecognizable h264vb tree blossoms aren't much lower than the recognizable h265crf ones. Human subjective perception of visual quality is modeled better with Netflix's neural-network based metric but i don't have time for that one.