The best replacement for fuji x100s is sony rx1.

The best alternatives to fuji x100s are rated as following:
★★★★★  sony rx1
★★★★  ricoh gr
★★★★  leica
★★★★  sony rx100
★★  sony rx100 ii
★★  leica x2
★★  leica m9
★  sony a7
★  sony rx1r
★  nikon coolpix a
★  olympus om-d e-m1
  rx1
  sony nex 7
  samsung nx300

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Speaking about fuji x100s, one probably shouldn't forget about off camera flash.

Other search terms related to fuji x100s and their ratings are:
★★★★★ off camera flash
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fuji x100s
sony rx1
ricoh gr