For those that remain sceptic about yafaray professional use I made a small test.
I downloaded a famous 3ds max scene from 2011 evermotion contest made by Steve Cole.
I converted it to a 3ds scene with uvmaps.
I imported it into blender because the script is nicer.
I then played around with yafaray settings.
Within 3ds max the scene is very slow and dificult to change.
Blender manages it much better.
I didn't had the trees so I placed ones made by andrew price.
I also didn't had the grass with displacement because I had only a small amount of time.
I made some vignetting and color balancing on the compositor and there you go!
Yafaray and Blender gave me a lesson:
Feed them with nice textures and you wil crop magnificent results!