The Sigma 150mm Macro has an average review score of 80.5%

Score (%):
Sigma 150mm f/2.8 EX DG HSM APO Macro (Tested)
Multiple user reviews on slrgear.com
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94

Sigma AF 150mm f/2.8 APO EX DG HSM macro - Review / Test Report
The full in-depth review from photozone.de
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67