I'm making some personal project with an animation, and was looking at the denoisers and found a very big difference between the Intel and the corona High quality one. The only problem with the intel is the temporal consistency so its a no go for animation ( hope it can change in the future!)
The corona One cant denoise quite well and can introduce some ugly artifacts, the intel one is doing a great job cleaning most of the image and retaining a great amount of detail with no visible artifacts.
Both renders were made with a noise level limit of 9% and a denoising amount of 8% and 1 radius
Tent image filter for both
Corona denoiser
Intel Denoiser
Biggest difference can be seen under the table where corona denoiser shows some weird shapes, the noise amount its higher on Corona denoiser.
couldn't find the corona comparison tool if you want to look at them
https://cdn.knightlab.com/libs/juxtapose/latest/embed/index.html?uid=90e47934-7142-11eb-83c8-ebb5d6f907df Corona denoiser
Intel Denoiser