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.
Article continues for subscribers...
If you’re already a subscriber, CLICK HERE TO LOG IN
diglloyd Advanced Photography includes hundreds of pages of exclusive coverage and high resolution, Retina-grade example pictures detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare. Also included is a wealth of in-context technique and workflow insight. Since 2006, diglloyd Advanced Photography is the authoritative review and on-line reference for discerning Canon and Nikon shooters. Subscriptions cost $ per year.
Sigma 50/1.4: mouse over to see Canon EF 50/1.4