The Zeiss Otus 55mm f1.4 has an 82mm filter size too. ... I believe the Otus 55/1.4 is a 77mm.
True, but the point he made still stands. A typical 50-55mm f/1.4 has a 58mm filter size. 77mm is huge for a 55mm f/1.4.
It seems lots of these lenses that do better at the edges than before are having extra larger fronts (70-300L, 24-70 II, 55mm Otus, etc.).