The best replacement for x100 is s300.

The best alternatives to x100 are rated as following:
★★★★★  s300
★★★★★  x100s
★★★★  x20
★★★★  xe1
★★★  rx100
★★  s400
★★  leica
★★  x10
★★  kbs tour x
★  project x 6.0
★  100s
★  x200
★  x1
★  m9
★  omd
★  gf2
★  g1x
★  m8
★  leica x1
★  ricoh gr
★  nex 7
★  gx1
  xpro1
  apx2
  fuji x10
  px 6.5
  sony rx100
  x001
  ep3
  project x
  olympus ep3
  gf1
  omd em5
  x-pro 1
  x2

Your alternative for x100 is not listed? Suggest!
Speaking about x100, one probably shouldn't forget about nikon flash.

Other search terms related to x100 and their ratings are:
★★★★★ nikon flash
★★★★★ ef-x20
★★ sb900
You have in mind a companion for x100 and it is not yet here? Propose!



Google Trends

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x100
s300
x100s