I think, picture quality-wise, an OPPO with Darby would be better than a 4K Ultra-HD TV. I have OPPO with Darby and the picture quality is noticeably sharper with Darby on. I think I'm using 60% on the Darby setting.

I doubt you can say that for 1080 vs 4K comparison.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing