I wonder too. It prevents me to sell the 17-40 and to order the 16-35 f/4 IS. I am very impatient and curious :-)
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I don't have any problem to understand that the back ground or fore ground can be nervous , but here are the 2 lenses compared at the same distances and there are several distances.
But neither of them reveals anything like this:
Your "several distances" are too short. You concluded that both lenses have wonderful bokeh, which is incorrect in many situations. They typically include shooting half-body environmental portraits, not miniature toys; and not always wide open.