> I'm afraid you will probably have to compare them yourself; such work is
> time-consuming and very scene-dependent, and so quite rare.

There is a comparison of various renderer on a simple scene here:
http://www.winosi.onlinehome.de/Gallery_t14_01.htm

But they are not all raytracers, and it would take some time to 
investigate on the scene description language of each. And some may be 
outdated... POV for example is not at the latest version.

-- 
Vincent

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