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I have tried different filter combinations with the 16-35.... B+W CPL, Big Stopper, and various ND/grads. I get banding issues anytime the CPL gets involved with one of the ND filters. It's either CPL only or ND grads only, but never mix the two.
I have never had that issue, and I use a CPL and an ND all the time. Both on the 16-35 and also the 24-120mm...