Both Netflix and Amazon stream in 4K. Cameras like the Sony a7S and the Panasonic Lumix GH4 can shoot in 4K. Even smartphones have been getting in on the act, with handsets like the LG G Pro 2 and Sony Xperia Z2 capable of recording 4K video. So with the amount of 4K content available increasing every day, you may have been thinking about buying a 4K set so you too can bask in the glow of 3,840 x 2,160 resolution. But 4K sets don't come cheap, and you're going to want to do a bit of research before dropping that much cash. While we don't really review televisions here at Engadget, we've done the next best thing, compiling the opinions of trusted critics from across the web. Which set offers you the most bang for your buck? Do bells and whistles like a curved screen make a difference? Check out a few members of the 4K Class of 2014 below.