see also:

• Canon EF lenses
• Sigma 12-24mm f/4 DG HSM Art full frame lens
• Sigma 18-35mm f/1.8 DG HSM Art APS-C/DX lens
• Sigma 24mm f/1.4 DG HSM Art full frame lens
• Sigma 24-35mm f/2 DG HSM Art full frame lens
• Sigma 35mm f/1.4 DG HSM Art full frame lens
• Sigma 50-100mm f/1.8 DG HSM Art APS-C/DX lens
• Sigma 85mm f/1.4 DG HSM Art full frame lens

• 50mm f/1.4 full frame AF lens in various mounts (Canon EF, Nikon F, Sony Alpha, and Sigma SA mounts)
• announced Jan 2014
• optically the best 50mm lens under $2000

• 50mm f/1.4 full frame AF lens
• 13 elements in 8 groups retrofocal design incl. 3 SLD glass elements and 1 ASPH
• Super Multi-Layer Coating
• 9 rounded blades
• 77mm filter thread
• HSM AF with full MF override
• internal focus
• close focus 0.4m
• 85mm x 100mm long
• 815 g (28.7 oz)
• $US950

• http://www.kenrockwell.com/sigma/50mm-f14.htm
• https://www.dpreview.com/reviews/sigma-50mm-f1-4-dg-hsm
• http://www.imaging-resource.com/lenses/sigma/50mm-f1.4-dg-hsm-a/review/
  • just as sharp right in the center as the $4000 Zeiss 55mm ƒ/1.4 Otus, lens, while the Otus shows better sharpness in the corners
  • stop down to ƒ/2.8, the Zeiss 55mm and Sigma 50mm show very similar, very sharp and very flat blur characteristics
  • At ƒ/1.4 and on a full-frame camera, it pretty well blows all of the other 50mm lenses out of the water. The Canon 50/1.2L is pretty sharp in the center, but the corners are extremely soft. The Nikon 58/1.4 is less sharp in the center, and quite soft in other parts of the frame. The Sony 55/1.8 obviously doesn't get to ƒ/1.4 at all. The other lenses all improve at ƒ/2, but so does the Sigma 50mm, easily bettering all comers, at every point across the frame
  • 1EV vignetting, almost immeasurable geometric distortion
  • less CA than the Canon 50mm f/1.2 but a little more than the Nikon or Sony
  • doesn't feel like the fastest AF in the world when racking all the way from minimum to infinity focus, which takes around one second
• http://www.photozone.de/canon_eos_ff/876-sigma50f14art
• https://www.dxomark.com/Reviews/Sigma-50mm-F1.4-DG-HSM-Art-Nikon-mount-review-The-standard
• https://petapixel.com/2014/09/04/review-sigmas-50mm-f1-4-simply-stunning-stunningly-simple/
• https://photographylife.com/sigma-50mm-f1-4-art-sharpness-and-bokeh-comparison/
• http://neilvn.com/tangents/review-sigma-50mm-f1-4-art-lens/
• https://www.slrlounge.com/head2head-sigma-50mm-f1-4-dg-hsm-art-vs-canon-50mm-f1-2/
• Youtube: Lens Comparison: Sigma 50mm f/1.4 ART vs Canon 50mm f/1.2L by Matthew Gore
  • much sharper edge to edge at up until f/8
  • much less CA and ghosting up to f/2 and less vignetting
  • 3% wider field of view (Sigma is probably closer to 48.5mm)
  • much larger, heavier and seems to AF faster
  • bokeh more contrasty but rounder and less onion rings (Canon also clips the bokeh circles at f/1.2)
  • AF with the Canon required resorting to single AF and even then was tricky at f/1.2 but both were similar at f1.4
• youtube: Battle of the Fast 50mm's: Sigma f1.4 Art vs. Canon f1.2 L vs. Nikon 58mm f1.4G by DigitalRev TV
  • best bokeh wide open: Nikon > Canon > Sigma
  • sharpest wide open: Sigma > Canon > Nikon