If you look at the datasheets for the Zeiss and Kenko Zeta L41 filters, they look very similar. I've used both and sometimes I think the Kenko does the slightest more filtering of that cast, but it's so close it is easily within the margin of error for conditions changing, etc. (And my brain subconsciously influencing which I think looks better.)
While you may still see a little...it's so faint that it really doesn't bother me. Especially when having to deal with the unfiltered results.
As for coatings, the Zeiss uses T*.....but the Kenko's seem very good to.
Obviously Vivek can speak first hand about the Kenko filters as he tested them first hand for UV blocking.
