[Phil Lelyveld comment: this is a good state of the industry story, covering cameras, editing, displays, and distribution.]
In the U.S., you can buy 4K TVs for around $1,000 on eBay, or three or four times that price from manufacturers like Sony and Sharp. One note about 4K monitors: there’s a difference between cinema 4K, television’s UltraHD, and 4K computer monitors; the latter may come in several different aspect ratios. Also, there are new color gamuts including a Cinema gamut and Rec. 2020 that are much larger than Rec.709. Very few current monitors can do the high-end gammas: which may be a reason for hanging back on a 4K purchase.
Do consumers really need a 4K TV, and will they buy one anyway? Is there a noticeable difference to HD? If you have a very large TV, and you’re sitting close to it, then yes?
See the full story here: http://filmmakermagazine.com/77119-the-state-of-4k/