Zeiss ZF.2 / ZE Distortion: 15/2.8, 18/3.5, 21/2.8 Distagons
Examples and discussion of distortion with the Zeiss 21mm f/2.8 Distagon have been updated. See 21/2.8 Distortion and Distortion vs Nikon 14-24/2.8G.
Similarly, see the 18/3.5 Distortion and Distortion vs Nikon 14-24/2.8G.
And 15/32.8 Distortion and 25/2.8 Distagon.
The above distortion pages above now have corrected + uncorrected toggles in HD and Ultra HD.