Oscar J wrote:
Indigo lacks sharpness of the edges as the account in order to add intellectual sharpness? or is that the only way out is rendering high-resolution, reduction in x0.5?
... Huh? If you're talking about anti-aliasing, Indigo has plenty of settings for that.
But antialiasing will mask noise. It's worth to ask what filter settings were used.
Sure, Indigo's superior AA is probably a contributing factor for beating the others. In Cycles, Octane etc you often have to downsize renders to get decent image quality because of their perfectly pixel aligned noise.
But it's also down to things like overall rendering speed, material models (see the huge differences in realism on the glossy dragon), how Indigo handles DOF compared to, say Corona, and how well it renders caustics, etc.