The best replacement for nikon lens is canon lens.

The best alternatives to nikon lens are rated as following:
★★★★★  canon lens
★★★  sigma lens
★★★  tamron lens
★★  canon
★  tamron
★  sigma
★  nikkor lens
★  sony lens
  canon l lens
  leica
  3rd party lens
  tokina
  carl zeiss
  lomo lens

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

Other search terms related to nikon lens and their ratings are:
★★★★★ canon body
★★ sony a7
★★ canon mount
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nikon lens
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sigma lens