i bought a model from turbosquid which was created in maya with the hypersmooth modifier. In Blender it has very hard edges. So i used a subsurface modifier and a smooth modifier to make it soft again. In the preview render view in blender it looks perfektly smooth but when i render it out it is still edgy. I now increased the iterations of the smooth modifier, it´s getting better but there are still hard edges. Also the Preview Render looks way more realistic in my opinion than the final render. Use modifer in render is tunred on of course.
https://www.dropbox.com/sh/kc269zv8uptjijz/AACsoeVHyZJjrAptTd1f8Uwxa?dl=0