The best replacement for 85mm 1.8 is 50mm 1.4.

The best alternatives to 85mm 1.8 are rated as following:
★★★★★  50mm 1.4
★★★★★  1.2
★★★★  50mm 1.8
★★★★  50mm 1.4 nikon
★★★  1.4
★★★  100mm 2.0
★★  100mm 2.8
★★  85mm 1.4
★  135mm f2
★  105mm 2.8
★  100mm 2.8 macro
★  50mm 1.4 canon
★  70-200mm f4
★  35mm 1.8
★  100mm f2
  1.4 canon
  85mm 1.2
  sigma 85mm 1.4
  100mm macro
  85mm 1.4 nikon

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Speaking about 85mm 1.8, one probably shouldn't forget about 7d.

Other search terms related to 85mm 1.8 and their ratings are:
★★★★★ 7d
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85mm 1.8
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