Got the WII filter this weekend. Fits perfectly and works great. The slight color mismatch is even less noticeable than I expected, so not an issue at all. Thanks again for your support.
I hope you like it as much as I do - I have found it to be incredibly useful to cut reflections, reduce dynamic range (by killing the glare), slow shutter speeds, and punch up the colors. I wasn't expecting to get so much use out of it, but I have.
EOS 1D X, 5DIII, M + EF 24 f/1.4II, 50 f/1.2, 85 f/1.2II, 300 f/2.8 IS II || 16-35 f/4 IS, 24-70 f/2.8II, 70-200 f/2.8II || TS-E 17 f/4, 24 f/3.5II || M 22 f/2, 18-55 f/3.5-5.6 IS || 1.4x III, 2x III