PBR reads light data from IBL images and not from the scene, therefore IBL is of paramount importance to the PBR environment.
IBL provides PBR shaders not just specular highlights but also lighting information.
Using completely different IBL images can overhaul the lighting of the entire scene.
With the latest improvements to IBL coming in Character Creator 2.0 Beta, one can adjust PBR environments with ease.
IBL workflow can be separated into the following categories: