Although it does help reduce reflections somewhat, the curved shape of Samsung's UNHU9000 4K TV does nothing else to improve image quality, and in some ways actually impairs it. And it costs a whole lot more than a flat TV.
The speakers of Sony's XBR-X900B have come to kick butt and offer no apologies. They provide the sweetest sound we've heard from any TV, and combine with stellar picture quality to deliver the complete package. As long as you like the look of speakers, that is.