The best replacement for leica lens is carl zeiss.

The best alternatives to leica lens are rated as following:
★★★★★  carl zeiss
★★★  zeiss
★★  lumix lens
★  pentax lens
★  lumix
★  zeiss lens
★  carl zeiss lens
★  voigtlander
  lumix dc vario

Your alternative for leica lens is not listed? Suggest!
Speaking about leica lens, one probably shouldn't forget about gf1.

Other search terms related to leica lens and their ratings are:
★★★★★ gf1
★★★★ sony a7
★★★ nikon body
★ sony nex
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