I think it's all bs. In the same price range, you'll get the same sort of results. The best of Hoya, B +W and others will give the same result. my 2c.
Yeah, I kinda figured the same, but asked the question out of curiosity... I don't want to be putting a cheap piece of glass on a great lens... and I went to the B+W official website... There's this filter called 105E SOFT PRO and their price on it is $557.00 EA... Is this a joke or what?
And I haven't heard anything on Cokin from anyone here? I know they used to be pretty big with those square filters.