CES 2013 - Sharp have used the Consumer Electronics Show this year to push their new Igzo 4K monitor, where Gizmodo have had some eyes-on experience with it and have loved it.
They've reported that the viewing angle is "absurdly good", the clarity is "nuts" and the resolution "makes even very small type readable". This kind of technology really requires a user to look at it to get a sense of scale and quality, and is really hard to translate into words.
Igzo tech is something worth mentioning here, as it is great for getting a display thin and very power efficient. This is the technology that allows Sharp to not just have the ability to show them off at tech shows, but to reach mass production so that you and I can buy one.