The best replacement for nikon lenses is canon.

The best alternatives to nikon lenses are rated as following:
★★★★★  canon
★★★★★  canon lenses
★★  tamron lenses
★★  sigma
★★  pentax lenses
★★  crizal
★★  sony lenses
★  sigma lenses
★  canon l lenses
★  tamron
★  leica lenses
★  pentax
★  zeiss
★  essilor
★  nikkor
★  sigma tamron
★  zeiss lenses
  olympus lenses
  takumar lenses

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Speaking about nikon lenses, one probably shouldn't forget about sony a7.

Other search terms related to nikon lenses and their ratings are:
★★★★★ sony a7
★★★★★ sony a7r
★ canon body
olympus pen
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