GTA V is likely to have much more impressive pedestrians and a much deeper world. ACU looks alot better then this aswell. The Witcher 3 doesn't even use PBR. The lighting doesn't look great nor does the environment, it just looks average.
It does have a PBR compliant pipeline.
http://www.eurogamer.net/articles/digitalfoundry-2014-the-witcher-3-tech-analysis