The best replacement for l lens is non l lens.

The best alternatives to l lens are rated as following:
★★★★★  non l lens
★★★★  kit lens
★★  nikon lens
★★  nikkor
★  carl zeiss

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Speaking about l lens, one probably shouldn't forget about canon 7d.

Other search terms related to l lens and their ratings are:
★★★★★ canon 7d
★★★ t2i
★★★ 7d
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l lens
non l lens
kit lens