Slowly but surely, after years of waiting and angst, 4K is becoming a thing. Ultra HD Blu-ray discs are already available in stores around the country -- at a moderate price premium over a standard Blu-ray or DVD -- and Netflix's repertoire of 4K content is growing and growing. The Panasonic DMP-UB900 is a 4K Ultra HD Blu-ray disc player that not only promises amazing improvements in picture quality, but also the best sound, including for 7.1-channel home theatre systems, as well as a design that'll be at home in the most distinguished and serious home theatres.