Get the Sigma 24mm f/1.4 DG HSM Art at B&H Photo.
In my review of the Sigma 24mm f/1.4 DG HSM Art, this aperture series uses an exceptionally demanding subject to show the limits of the Sigma 24/1.4A.
Presented with HD and UltraHD images to to 24 megapixels (6048 wide), along with large crops from ƒ/1.4 - ƒ/9.
It‘s a very fine performance, but clearly there is plenty of room for a Zeiss Otus in this focal length range. Still, the performance is likely unequalled by the Canon and Nikon f/1.4 offerings, so the price of $849 for the Sigma 24mm f/1.4 DG HSM Art is amazing (also, as this was written, there is a 4% reward and free expedited shipping, pretty much no-brainer for anyone looking for a first class autofocus 24mm).