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The smaller iMac gets an optional 4K display, all the 27-inch models have 5K:
http://www.engadget.com/2015/10/13/4k-imac/
Apple iMac review (2015): 4K is optional, faster hard drives shouldn't be
http://www.engadget.com/2015/10/13/apple-imac-review-2015-21-5-inch-4k/
http://www.engadget.com/2015/10/13/4k-imac/
Apple iMac review (2015): 4K is optional, faster hard drives shouldn't be
http://www.engadget.com/2015/10/13/apple-imac-review-2015-21-5-inch-4k/
Going forward, all the 27-inch models have a 5K screen -- not just the flagship we reviewed last year -- while the 21.5-inch version now has an optional 4K panel. Across the board, too, these new 4K and 5K displays have a wider color gamut, although the difference is fairly subtle. Possibly more important than the iMac itself, though, are the input devices: Apple redesigned the wireless keyboard, mouse and trackpad, adding rechargeable batteries and, in the case of the touchpad, pressure-sensitive Force Touch gestures.