The best replacement for sony hx300 is canon sx50.

The best alternatives to sony hx300 are rated as following:
★★★★★  canon sx50
★★★★  nikon p520
★★  sony a3000
★★  fujifilm sl1000
★★  nikon p600
★  canon sx50hs
★  fuji hs50
★  lumix fz70
★  fuji sl1000
★  lumix fz200
  panasonic fz70
  fuji hs50exr
  canon powershot sx50
  canon sx50 hs

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Speaking about sony hx300, one probably shouldn't forget about canon sx50.

Other search terms related to sony hx300 and their ratings are:
★★★★★ canon sx50
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