The best replacement for canon g15 is g1x.

The best alternatives to canon g15 are rated as following:
★★★★★  g1x
★★★★★  sony rx100
★★★★  nikon p7700
★★★  s110
★★★  lumix lx7
★  fuji x20
★  nikon p7800
★  lx7
★  canon g1x
★  fujifilm x20
★  canon s110
★  panasonic lx7
★  olympus xz-2
  canon g12
  nikon 7700
  fuji x10
  nikon p520
  canon g16
  fujifilm x10

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Speaking about canon g15, one probably shouldn't forget about nikon p7700.

Other search terms related to canon g15 and their ratings are:
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canon g15
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