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 follow-on aperture series confirms the one just prior with absolute certainty of the behaviors by placing the focus appropriately so that everything can be told without any hesitation.
It is also a practical series in showing just what one must account for for obtaining peak results, e.g., where to focus and how much stopping down to expect. In short, essential reading for the Sigma 24mm f/1.4 DG HSM Art user.
Presented with HD and UltraHD images to to 24 megapixels (6048 wide), along with large crops from f/1.4 - f/9.