Which scenario is better for testing purpose than some easy balls?
While the creators of Fryrender are promising to release Random Control, an unbiased realtime renderer but don´t, I found Keyshot by Luxion. It´s very small and it´s fascinating and easy to use. It doesn´t support mapping for anisotrophy or SSS but who cares? It´s in realtime!
Time to build the scene at this sample level: about 20 minutes.
amount of blur shader samples: 32
ray depth (bounces): 6
depth of field sampling quality: 10