The Panasonic DPUB420 4K Blu-ray disc player is considered the best option for 4K TVs. It is praised for its ability to optimize the picture and sound quality of movies, providing an unbeatable movie-watching experience in both HD and 4K. The player also has advanced upscaling capabilities, making the best of old collections of HD Blu-rays or even DVDs. The Sony UBPX700 is another highly recommended option, offering similar features and performance at a more affordable price point. In general, a dedicated 4K Blu-ray player is recommended for those who prioritize picture and sound quality in their home cinema setup.