Since I like to photograph landscapes, and thereby crisper colors like (especially easy cloudy dark blue sky), a polarizing filter in many recordings of this type is mandatory for me. In this application environment, about 1 to 2 EV "light swallowing" of the filter are irrelevant, you should know it, however.
Qualitatively, the Zeiss T * filter on-par with the MRC F-Pro from B + W. One advantage of the Zeiss filters is that they do not have as high margins, but still high enough to keep safely to the lens cap.
