I like it that he states that Sigma's Art 1.4 24mm is the best 24mm 1.4. I am sure he is right, but i think not in every aspect.
( for once there was no Otus around)
But than the dpreview boys did not do the lens justice. The samples they took did not show that at all.
I am on a nikkor 1,4 24mm and i realize these wide angles are not easy to grasp.
They often have a very complex rendering/field of sharpness that changes a lot with only slight changes in aperture and/or focus distance.
At d8-11 they usually come to rest...