The best replacement for sx50 is fz200.

The best alternatives to sx50 are rated as following:
★★★★★  fz200
★★★★★  sx510
★★★★  sx40
★★★★  hx300
★★★  p520
★★★  sx500
★★★  fz70
★★★  p600
★★  panasonic fz200
★★  nikon p520
★★  g16
★★  p510
★★  canon sx500
★★  g15
★  nikon p510
★  sony hx300
★  l820
★  lumix fz200
★  hs50exr
★  panasonic fz70
★  g1x
★  sony hx200v
  hx50v
  nikon coolpix p510

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Speaking about sx50, one probably shouldn't forget about nikon p520.

Other search terms related to sx50 and their ratings are:
★★★★★ nikon p520
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sx50
fz200
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