That's a bit of a head scratcher how the same technology of the three Canon's above are so tightly grouped, and the pixel size of the 6D2 sits between the 1DX II and the 5D4 ... and somehow comes out with a radically different value, not even in the same general ballpark. Imo, I was expecting it to land somewhere between the 80D and the 1DX II ... or at least close to my 80D.
Single data point result kinda defies the expectation quite a bit. I'm hoping that we learn otherwise as time passes.