The K2 will essentially fill the role of a mixer with some extra controls added on, but trust, me if you want to make a comprehensive compact setup, you will
need additional controllers. The K2 with 2 additional X1s is a -sweet- way of having a 4 channel mixer and 4 decks in a very small footprint. My girlfriend has a K2 and X1 and loves that combo for its ease of carrying around, while I have a Xone:62 that I use with my X1s.
Bear in mind however that the K2 is really not sold to the same segment of the market as the S2. The K2 and 2 X1s is a setup designed to mimic/complement a club install mixer + 4 decks. The S2 is a consumer level all-in-one toy. Regarding form/function, the K2 has more in common with the F1 and X1 (and you could argue the Z1, but I have a Z1 that I travel with and the K2 is really on a different level in terms of capabilities), than it does the S2.
I mocked up some examples of use scenarios for you to help you understand!
My setup, which you can emulate somewhat with a K2 and 2 X1s...
4ch62.jpg
Like this!
4chK2.jpg
Equivalent of Traktor S2 in terms of mixer/X1 hardware (whoa that's a lot less stuff!)
2ch22.jpg
Alternative setup of Xone:K2, using inner channels as mixer, outer channels as Xone:92 Filter emulation in traktor, and an X1 for transport/browsing/other fx.
2chK2.jpg
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