Hi Tyler, the upload here on the cow made it kind of blurry, hard to tell.
But where does it look jagged, in a media player ?
Does it look equally bad when you import the footage back into After Effects, a difference between different apps could be the case if you’re on a hiDPI screen.
You could overlay your rendered image on top of the comp with difference blend mod and see what’s going on.
If it was hard contrast between different colors it would be due to the 422 chroma subsampling, but here it’s clearly contrast in the Luma channels only…
You’re positive it was 422 HQ and not a proxy/LT version ?