Hi Maru,
I don't think we have something wrong with Corona caustics, Iray has a better definition for the caustics itself I think, also it cleans faster because of the GPU. My main question is how to get a cleaner look with caustics like this on Corona, I tried experimental settings but it didn't work as expected, I got too much noise and fireflies, even with denoiser set to remove fireflies.
Overall the look of the caustics are the same between Iray and Corona, so maybe I've written the question in the wrong way. :)
Thanks anyway.
Leo.