Principled is really nice though, if you look at the inputs and what's going on there. It would be the only reason for me to upgrade to 12 really. At least thus far. The only real problem I see with Superfly is it has a tendency to reveal bad assets. You need to use nice models, textures, and shaders for it to look as it should. I mean that's not a problem with Superfly, more a problem with using such a renderer with subpar assets.