The best replacement for canon lens is nikon lens.

The best alternatives to canon lens are rated as following:
★★★★★  nikon lens
★★★  tamron lens
★★  tamron
★★  sigma
★★  nikon
★★  sigma lens
★  carl zeiss
★  sony lens
  leica
  zeiss
  rncz
  nikkor lens

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

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