The Zeiss are better than the GPO but not by a huge margin. The edges are sharper on the Zeiss but the main part of the field is about the same. Zeiss has a whiter or bluer hue to them and the GPO have a slight yellow tint. I was more than willing to keep the GPO though if the Zeiss had sold first. I doubt there would be any practical difference in the field up to legal shooting light.
Lee
