I've been following this thread since it started and waiting to see how it plays out. The big decision I trying to make is whether to buy the 170mm or 180mm dome port for this lens. The 170mm is so much easier to travel with. It fits in my carry bags. I want one dome for both the 12-40mm and 7-14mm.
I get a feeling they are the same piece of glass - as measuring my 170mm its actually 180mm edge to edge (including the frame)