The Sigma 15mm f/1.4 vs. Sony 15mm f/1.4 G vs. Viltrox 15mm f/1.7: Which APS-C Lens Wins?

The Sigma 16mm f/1.4 has been the bestselling APS-C mirrorless lens of all time, and Sigma just replaced it with something smaller, sharper, and better built. Whether the new Sigma 15mm f/1.4 is actually worth picking over the Sony or the budget Viltrox is a more complicated question than it might look. 

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