Originally posted by maucard Of course the differences may be explained by errors made during in the procedure of the lens performance tests,
and lens sample variation, and differences in camera. CA, resolution and some other things are affected by the camera sensor, since a higher MP sensor will "record" more CA than a lower MP sensor. The cameras used for these tests were different cameras (brand, sensor), you cannot really do valid comparisons.
Finally, the lens construction itself can have effects - if the inside is less or more reflective, if the aperture blades are too shiny, if the lens hood is better optimized, etc.
Interesting to see such big differences, but I think there would have to be a special comparative test done, with multiple copies of each lens on just one camera (likely adapted to a Sony, because it can take various mounts), to truly answer your question.
Until then, all we have is various lab reviews (from magazines, websites) and user reviews.