, Hi. Think in therms of the size of the sensor that captures the image. is like if I compare the 4k of my note 4 to one of the sensors of a "full Frame" DSLR camera... an if you want to see the real difference u need at least (for this last one) a 50" 4k screen..or smarTV (which I'm planning to buy very soon) (with 3D of course). Cheers. David.