Renderman (blender addon) VS Blender Cycles
My lego minifig, matching material colours, textures and lighting setup.
Renderman : samples 147 : Time 28 min (using only 3 threads)
Cycles : samples 600 : Time 1 hour 28 min approx (using 4 threads)
Renderman : NA
Cycles : samples 600 : Time 9 min
It would seem Renderman is alot faster (non GPU), I expect this is more apparent with bigger scenes!
Looking forward to better blender integration in future.