At default zoom the image is 20% of the width of my monitor so it's hard to see artefacts. When zoomed in the posterization is noticeable but jpeg at 85% is abo

At default zoom the image is 20% of the width of my monitor so it's hard to see artefacts. When zoomed in the posterization is noticeable but jpeg at 85% is about as bad as webp. I don't see any substantial difference in lighting.