DAZ Studio users have been enjoying unbiased, physically based rendering (PBR) via GPU for a good while now. The go to for many users up till now has been ...
How to Build a quad-GPU rig for monster Iray performance (and animating) - Page 2 - Daz 3D Forums
Iray car related shader presets 'megapack' ...
This image of a swimming pool makes us want to dive right in, but in
Maxon partnered with Nvidia on Iray for Cinema 4D
m4d - mental ray and iray for C4D
Fireplace Storch for catalog, 3ds Max & Iray render
Using MDL to Share Physically Based Materials - Lutz Kettner and Jan Jordan, NVIDIA
(this will work for Iray too)
Substance Designer 5.3 is now with NVIDIA's Iray
... Monique close-up portrait v1 by Livius70
This render really shows off the superiority of the Iray render engine. Notice her fingers