Netflix has begun streaming in 4K, at least on a few shows. Currently the Netflix Original Series, “House of Cards” as well as some nature documentaries are now available to stream in 4k/Ultra HD.
It should be noted that you need to have a TV that supports the higher resolution.
The programs that are included in the Ultra HD will appear with a tiny label so you know you are getting the extra pixels. Currently, Netflix is limiting 4k streaming to only TVs with Netflix and HEVC/H.265 decoding capabilities built in.
HDTVtest.com notes that the higher resolution stream really shines with “bright, colorful scenes” adding that the images were “rendered with greater sharpness and smoother gradients.”
Still, the bitrate of these streams are only around 15 Mbps so while the picture will be superior to HD Netflix, this flavor of 4K is not a true demonstration of the higher resolution. HDTVtest.com adds that to their trained eyes, some Blu-ray titles still offer a cleaner image.