Uhd Netflix on my Samsung 4k smartv is awesome, its as perfect as I have seen.
You can make Netflix do 4k on a laptop with a browser hack bit its not as good.
I'm worried by the advert possibility but if it becomes a problem it will be easy to break Samsung's firmware encryption according to guides I've found online.
My smartv also does dlna so well I use it as reference implementation for my work testing media devices.
Most of the apps are just front ends for websites but there are some quite impressive games using unity. It really needs a nicer looking audio player app with a visualiser.
I can connect a USB hard disk full of media randomly collected over the last few years an it plays them all.