The best replacement for canon lenses is nikon lenses.

The best alternatives to canon lenses are rated as following:
★★★★★  nikon lenses
★★★  sigma lenses
★★  nikon
★★  tamron lenses
★  tamron
★  nikkor
★  sigma
★  zeiss lenses
★  nikkor lenses
  third party lenses
  taiwan lenses
  olympus lenses
  carl zeiss
  sigma tamron
  sony lenses
  pentax lenses
  leica

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Speaking about canon lenses, one probably shouldn't forget about sony a7r.

Other search terms related to canon lenses and their ratings are:
★★★★★ sony a7r
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