see also:

• Canon EF lenses
• Sigma 12-24mm f/4 DG HSM Art full frame lens
• Sigma 20mm 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 50mm 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

• 24mm f/1.4 full frame AF lens in various mounts
• announced 2015 at half the price of the Canon lens but no weather sealing

• 24mm f/1.4 full frame AF lens
• no weather sealing
• 77mm filter
• HSM AF
• 9 rounded blades
• 15 elements in 11 groups including 3xSLD, 3xFLD and 2x aspherical elements
• close focus 0.25m
• 85×90.2mm
• 665g
• $US850

• http://www.photozone.de/canon_eos_ff/944-sigma24f14art
  • 0.9% barrel distortion
  • 3EV vignetting wide open and 1.6EV at f/2 and less than 0.5 EV at f/4 and smaller
  • centre sharpness is good wide open becoming excellent at f/2-f/8
  • soft in edges wide open but becomes “good to very good” at f/2.8-f/8
  • well controlled CA
  • nice bokeh can be nervous
• https://landscapephotographymagazine.com/2015/gear-test-sigma-24mm-f1-4-dg-hsm-art/
• https://www.cameralabs.com/sigma-24mm-f1-4-dg-hsm-art-review/
• https://petapixel.com/2015/04/29/sigma-24mm-f1-4-art-lens-review-one-f-stop-to-rule-them-all/