H i everyone , im seriously searching for a long time and didn't find any , it seems like there are two types of pbr textures out there 

 - metalness workflow (works great in principled shader) - Inaccurate 
 - Specular workflow (it seams that there is a shader in blender only for eevee which not working accurate) - Accurate

my plan is to use blender to create high quality 3d renderings with my Specular tectures but didn't found any accurate way to do that .