The polarizing filter darkens a bit off, but is quite normal since it filters the Spieglungen.
When the filter turn can regulate the color saturation (sunlight / Mirroring).
Sharpness is as before except that the colors are vivid.
The 77mm pole filter I use on a Tokina Pro II 11-16mm focal length camera is an EOS 60D.
am happy and the price is also super, purely out of interest would be surprised if a 90 euros more expensive filter is better.