Forums and reviews that restrict discussion to the mount of lens you are interested in. Basically you only need to know how a minolta mount compares to another minolta mount or EF vs EF or F vs F. Polled results have little meaning compared across brands as the results are not accurate when interpreted as such.
The polls on photozone.de cannot be used as a gauge across the board. They are only slightly relevant when you view them in the specific classes.i.e Nikon F mount, Standard Zoom, Constant aperture. Even then, some of the results are suspect.(e.g the New Tokina 28-70 ATX PRO SV is rated higher than the Nikon AFS 28-70.)
A number of new users have rated it as excellent wide open(!).