The best replacement for x100s is x-e2.

The best alternatives to x100s are rated as following:
★★★★★  x-e2
★★★★  rx1
★★★★  x100
★★★  x20
★★★  ricoh gr
★★★  x-e1
★★  rx100
★★  x pro1
★★  x-t1
★★  xt1
★★  rx100 ii
★★  omd
★  xe1
★  23mm
★  x-pro1
★  nex 6
★  sony rx1
★  23mm 1.4
★  omd em5
★  leica
★  gr
★  gx7
★  xpro1
★  nex 7
  em5

Your alternative for x100s is not listed? Suggest!
Speaking about x100s, one probably shouldn't forget about external flash.

Other search terms related to x100s and their ratings are:
★★★★★ external flash
★★ off camera flash
You have in mind a companion for x100s and it is not yet here? Propose!



Google Trends

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x100s
x-e2
rx1