Will probably buy that lens eventually. Review on a different site says if you step down to f4, the entire image is sharp.
So if you don’t care about it being sharp, use f1.1, if you want a shitload of bokeh. If you want sharp, use f4.
Any lens is good if stepping down makes it sharper. If you want a lower sharp aperture, you’ll need the Sigma, that’s expensive though.