Sony's new flagship receiver is a brute. It's got as many or more features, channels, HDMI jacks, and control options as any competitor I can think of, along with a snazzy new rotation of onscreen menus. The STR-DA5800ES is also the latest to join the 4K brigade, being able to pass-through, and upscale to, the possible-future Ultra HD video format. More on this in a year. Or two.