Last night I watched my reference movie 'The Mechanic by Charles Bronson' on my Intel i7 computer with Nvidia Ge Force 750 Ti HDMI Graphics Card. The movie was a hard copy dvd disc watched on widescreen side. Other side is fullscreen.
Now I was just going on memory but the Sony does a better job at upscaling exhibiting fine detail such as wood framing and brick work, looking well focused. Whereas the graphics card looked less detailed, blurry, unfocused.
Mind you there are better HDMI graphics cards on the market now that do 4k.
As for Netflix having watched a few older documentaries. I would say off hand that the Sony would do a better job of upscaling these as well. As for movies that are blu ray quality they look excellent on both my Sony and Samsung Smart TV. But haven't done a direct comparison to an outboard blu ray player.
Anything with a 4k graphics card is probably really good.