Carl Zeiss Distagon T* Otus 1,4/55 ZE (Canon) mount lens review: Peerless PrimeBy Kevin Carter - Tuesday November 26 2013 Lens Review
Compared against Canon’s premium ultra-fast standard, the EF 50mm f1.2L, the Zeiss is a significantly better performer. Although the Zeiss has better uniformity throughout the aperture range the principal benefits are to be seen at the widest apertures. It has much higher sharpness and excellent homogeneity at full aperture with significantly lower levels of chromatic aberration and vignetting. For instance, on the Canon chromatic aberration is noticeable in the outer 50% of the image field.