While some so-called 4K Blu-ray players only up-convert the video to 4K, the Sony 4K Blu-ray Player X-800 is a true 4K Ultra HD Blu-ray player. Not only is the 4K video performance impressive, but this player is also a universal disc player and a hi-res audio player. The Build The build quality is truly … » Learn More about Sony 4K Blu-ray Player X-800