At 1080p, fast motion (sports, action movies) often blurs due to pixel response time. 4K panels today almost universally support higher refresh rates (120Hz and above). This means that also means "now buttery smooth."
While a 1080p screen uses about 2 million pixels to form an image, a 4K screen uses over 8 million . now in 4k hd video
You need a 4K screen. And a fast connection. And often a paid subscription. Without those, “Now in 4K HD Video” is just a taunt — like showing a gourmet meal to someone with a fork and no mouth. At 1080p, fast motion (sports, action movies) often