The following may further illustrate the character of the new 21/1.4. Two sunny day shots followed by 100% sections. To my eye this lens has all the sharpness I need and is limited by the photographer,the sensor especially at 640 and my attempts to properly process the files. The micro contrast can be seen in the flag and the separation of tones in both the highlights and shadows. The final image is really how the lens is intended to differentiate itself in a low light situation. The lights come on at 10 30pm this time of year in Paris ....this image was Iso 640,f1.4,1/45 ..so its loss in IQ is due to ISO ,DOF and camera shake.
The Jpegs lost a lot from the originals ...the 100% crops are much sharper than the illustration but you get the idea. Best comparison is similar to the 35/1.4asph rendering .