Megascan does around 0.83. Some guides tells it's 0.76. Chat GPT told me 0.75. Adobe substance libraries have a lot of around 0.5-0.6. Textures.com are in range of 0.75-0.9. It all gave pretty subtle difference in our old renderer and Megacan ones looked almost matte and now 0.76 looks like a nuke when the sun is around 25…