The Sigma 18-125mm has an average review score of 74.3%

Score (%):
Sigma 18-125mm f/3.8-5.6 DC OS HSM
Sigma specialises in lenses that have a wide range of focal lengths and despite being a 7x zoom this is actually on the modest side by the manufacturer’s standards.
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84

Sigma 18-125mm f/3.5-5.6 DC (Tested)
Multiple user reviews on slrgear.com
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72

Sigma AF 18-125mm f/3.5-5.6 DC - Review / Test Report
The full in-depth review from photozone.de
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67