Get the Sigma 24mm f/1.4 DG HSM Art at B&H Photo.
MTF vs high end
I discuss the Sigma 24mm f/1.4 DG HSM Art MTF chart using the Leica 24/1.4 Summilux for comparison.
The lens world is advancing, with (from what I see) Sigma and Zeiss leading the charge for ultra high performance.
Canon and Nikon shooters: run, don’t walk and order this lens (about $849 plus 4% rewards at B&H Photo).