Brant, it was indeed 18", the 3' was my mistake typing today. I corrected the OP.

I reset the test up tonight and this time took a little more care than I did the first time. I had almost identical results. This time the 5D II crop was just a shade better than the 7D II x1.2 crop. From what I see x1.2 is the number.

There is about a 20% resolution benefit over the 5D II. I wonder how much this benefit would disappear with the 5D III's additional 5% pixel density.