I'm travelling now just using my phone so I can't really copy/paste links. But the comparison was done by Paul Sherstobitof to compare the results at filleted edges. Vray had sharp blocky shading at a G1 edge, while Brazil transitioned it nice & smooth. I think it was about 2-3 weeks ago. This may not be indicative of all AA situations, but it's a very important one for product shots