Post 1 looks pretty good, though not like a photograph because the tables and floor's reflections are too strong and the scene is spotless (no dirt). This is obviously a universe where entropy doesn't exist. 

I'm not familiar with Vray but know mental ray very well. Posts 3 & 5 don't look much better than Firefly IMHO. Tried Body Studio but stopped using it because it seems like a waste to not take advantage of the tools inside of "more powerful" systems.