Because of no ideal combination between the square filter and its holder, I used to prefer buying Nikon 16-35mm lenses than Nikon 14-24mm. For another reason, in my opinion, the best filter so far is Lee. Unfortunately the Lee SW150 holder system is not good, there is a wide gap between the filter and its holder. It has light leak which, of course, affects the result of the photo.
Some brands, like LucrOit and WonderPana, produces better holder than Lee for the light leak problem, but they use a bigger size filter (165mm). As the Lee-fans-boy, I only want to use a holder that supports 150mm Lee filter. Long story short, I found the NiSi 150 Holder System.