The 100L looks sharper in the corners to me on the TDP examples, obviously more vignetting, but slightly sharper. So that tends to make me reject both DxO and photozone testing. But all of this also tends to make me want to buy a 70-200 II since I'll never spring for a 200 L f2...
I do think what we're seeing is within the range of copy variability - if you look on TDP, he tested three copies of the 70-200 II (there's a popup menu so you can compare them).
I think the bottom line is that while there may be differences between the two lenses from a sharpness standpoint, the direction and magnitude of that difference is probably subject to lens copy variation. Most importantly, both offer excellent IQ that's probably not distinguishable in real world shooting.
So, IQ shouldn't be used as a distinguishing factor between these two lenses...it really comes down to whether you need to go to 1:1 magnification or not, whether you need the flexibility of a zoom, and what your budget will cover.