28mm: Zeiss 2.8/24-70mm, Tamron 2.8/28-75mm, Minolta 3.5-4.5/24-105mm

These are the results of the "slanted horizon" at 28mm. The pictures are directly displayed at pixel level here, you don't need to click anything.

First the full aperture: f/2.8 on the CZ and Tamron, f/4.0 for the Minolta zoom.

lens	Corner	Center
CZ
Min.
Tam.

Then, the same pictures at f/5.6 for the three lenses.

lens	Corner	Center
CZ
Min.
Tam.

And the pictures at f/11:

lens	Corner	Center
CZ
Min.
Tam.

I'll let you jump to Stephan's page so that you can make your own opinion. I will first present the pictures at 75mm in the following page and then give my interpretation of these tests.