20mm F1.4 DG HSM | Art (Canon EF mount) firmware v2.01

It has optimized the exposure during viewfinder shooting when used in combination with the EOS 90D and the EOS-1D X Mark III.It has reduced the operating sound of the lens diaphragm blades when attached with the SIGMA MOUNT CONVERTER MC-11 EF-E and used for shooting movies.It has reduced the operating sound of the lens diaphragm blades when used for shooting movies on Canon cameras.* * The degree of improvement differs depending on the camera used.