The tamron 90mm macro has an average review score of 85.7%

Score (%):
Tamron SP AF 90mm f/2.8 Di Macro
As Tamron’s macro has a focal length of 90mm rather than 100mm or 105mm, the lens has to be slightly closer than would otherwise be the case to record a true macro (1:1) image.
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88

Tamron 90mm f/2.8 Di Macro 1:1 SP AF (Tested)
Multiple user reviews on slrgear.com
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86

Tamron AF 90mm f/2.8 Di SP macro - Review / Test Report
The full in-depth review from photozone.de
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83