very nice to see my tests being discussed here.
In terms of "Eneen" that wanted to know the AA settings that were used:
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I guess thats the default settings.
In my personal experience I rather have a clean looking image. I do not care if its a tad softer then what other renderers produce. I professionally render either for animation in FullHD or for Print in really high res.
Personal stills I normally render in 4K. Normally there is enough room to use a sharpen filter if you ever have the feeling that the render looks a bit soft. If you compare it with photographs you normally do not get a pixel accurate result because of the bayer interpolation that needs to happen.
So for me Indigo does a great job here. But thats only my two cents!
The only reasons I prefer Octane over Indigo are:
Feature completeness with SSS, Dispersion, Volume rendering.
Nodal based material system.
Especially how it makes it possible to alter textures. Mix them with noises / other textures, multiply them remap the lightness values (ramp) etc.
Shader based (per object) Dirt (AO) / Inverted Dirt shader. Vertex Map Support.
There are so many things you can to using those effects working around UV-Unwrapping and object and painting textures for it.
You can produce used edges with inverted Dirt (AO) or get interesting effects by using it as a mix texture.
Falloff / Fresnel Shader that is uable inside any channel.
Material often display other angle based properties them. Therefore its important to have a tweakable shader that reads out the facing angle depending on the camera / viewer.