interesting.

 16 threads, are you running dual Xeon or so?

 pixel samples 8, that's 8x8 antiliasing. 3x3 would do I guess

 irradiance cache OFF ? and still artifacts "not too bad". Hmmmm.

 smooth polygons OFF ? and everything else is about high quality.

 render time? 

And I still don't know the question behind this answer. 

- - - - - 

Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though