The comparison includes distortion, a vignetting series, and of course sharpness. As a critical comparison, I double-shot this comparison on two different days with multiple aperture series per lens each time, a hassle, but worthwhile given the high performance of the lenses. All three lenses are very high performers, and so such a comparison is much harder than when comparing dissimilar lenses.
Obviously, my comparison did not use autofocus (such comparisons never do as it cannot be trusted). See below for more on AF with the 24/1.4G.