Upload & Sell: Off
The sample crops from TDP suggest that the performance at 50 mm (center of image) is worse than all other zoom lenses, including cheap ones, and that it does not improve substantially by stopping down, and that the copy variation is significant.
Indeed. Even when stopped down to f/8, performance of 24-70 f/4 lens at 50 mm remains poor, BOTH at the center and in the corners. Now, that is disturbing. If the lens performs well at 50 mm when stopped down, I will have no problem with it.