I noticed that in one of my scenes denoising delivers very dissapointing results when that scene is lit with Corona lights. OTOH it works perfectly fine when that same scene is lit with Corona sun and sky. Wonder what could be reason for such a difference?
Rendered couple crops as example and made gif alternating denoised vs not denoised versions. Both crops where rendered under same conditions: 100 passes, both took about the same time to render, both have similar brightness, both reached very small noise level - 0,3-0,6%.