The Sigma 30mm has an average review score of 75%

Score (%):
Sigma AF 30mm f/1.4 EX DC HSM
With a price-tag that is only just shy of £300, Sigma's 30mm optic is on the pricey side for a 'standard' lens and with good reason since it comes with an exceptionally fast f1.4 maximum aperture...
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83

Sigma 30mm f/1.4 EX DC HSM (Tested)
Multiple user reviews on slrgear.com
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79

Sigma AF 30mm f/1.4 EX HSM DC - Review / Test Report
The full in-depth review from photozone.de
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63