I thought you were discussing side AF points. Those eyes look pretty centered in the FOV to me, unless this is heavily cropped...which I doubt.
Did you read the description? There is no crop. Her right eye is near the center of the frame, and because she is nearly parallel to the sensor plane it is in focus. But AF
was on her left eye.
"1st photo SOOC, untouch: 5D III + 85L II, 1/160 @ f1.2, outer AF point, was focus on her left eye"
I get that kind of performance from my 5D3 outer cross-type points too (in one shot, I disable non-cross type AF), at least as best I can tell with shallow DOF from say 200mm/2.8.
5D2? Not so much. The 6D outer points are vertical line sensors like the 5D2, right? In landscape orientation it will just hunt on the outlying points if there is no vertical contrast. The 1Dx unit is sensitive in two directions widely across the frame. That's a significant improvement over the 5D2/6D.
I don't know of anyone who wanted a 5D3 at 6D prices. Rather, I suspect there are plenty who would pay $4500 for a 5D3.
Willingness to pay and a desire to pay are two different things. I certainly would have wanted a 5D3 at 6D prices. However, that's unrealistic.
As for there being plenty who would pay $4,500... I don't know. There may be some, but at that point, many may look elsewhere or decide to save a little bit more for the 1Dx.