Measured against the Canon EF 50mm f/1.4 and EF 50mm f/1.2L, and arbitrarily calling the Canon EF 50/1.4 a 50.0 mm lens, the EF 50mm f/1.2L comes in at 49.2mm, but the Sigma is substantially wider at 46.6mm.
The foregoing was determined shooting a target with all 3 lenses and measuring the pixels covered by the same subject matter.
Mouse over to see the significant difference between the Sigma and the Canon EF 50mm f/1.4. Observe the much more even illumination of the Sigma as compared to the Canon 50/1.4.
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Sigma 50/1.4: mouse over to see Canon EF 50/1.4