Rawalanche, I'm telling you, on all of the projects I've worked on, whether it's X-Men, Wolverine, Hunger Games, Game of Thrones, etc., and whether the objects conform to PBR or not, the comments about what looks real, and what doesn't look real, all have been subjective to whoever is commenting on whatever submission is being commented on.
I use and have used many renderers professionally in my career: PRman, 3Delight, Mantra, Arnold, VRay, Mental Ray, Maxwell, and more, and I really do hope that Corona doesn't break with what the enitre CG/VFX industry puts out by default. It will just cause unnecessary confusion.