but with an f/1.4 maximum aperture then focus backgrounds become viable. The bokeh is actually rather good and much better than might be expected of a 20mm lens. Flare is not an issue and even ...

There are also four F1.4 aperture prime ... this point will be the 11-20mm F2.8 F/2.8 Di III-A RXD. Those seven lenses are the beginning and there's plenty in the Sigma and Tamron inventory ...