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4k is referring to the overall number of pixels on a screen. Usually the resolution is 3840X2160 and has an aspect ratio of 16:9.
Despite 4K having almost double the number of pixels, the biggest visible difference is the ratio, the widescreen 21:9 is really going to stand out compared to the 16:9
Also, 4.9Mpixels is going to be a lot easy for most graphics cards to handle vs needing a hardware upgrade to run the 8.2Mpixels of a 4k monitor.
In my opinion (and actually that of many others too) you need a fairly large monitor to really appreciate a 4K monitor, 44" and bigger.
More on 4K as a marketing term to refer to 3840 X 2160: Technically, "Ultra High Definition" is actually a derivation of the 4K digital cinema standard. However while your local multiplex shows images in native 4096 x 2160 4K resolution, the new Ultra HD consumer format has a slightly lower resolution of 3840 X 2160