I'm actually surprised by this test. I thought this new lens would probably easily best the current 35mm f/1.4L in resolution, as the new Canon primes have all been exceptional performers. And, by a small margin at equal apertures, the new 35mm f/2 is sharper where it matters. But the corner performance really surprised me. While it made great strides over the original, it is completely blown away by the Sigma. I expected a more radical evolution over the original (which I was actually oddly fond of).
Except for those specifically looking for either IS or a smaller form factor, I think that the new Sigma is going to put a serious hurt on the sales of this lens. The Sigma is looking like more of a winner every day. I am still interested in seeing a bokeh comparison, but it seems to me that those who use a wide aperture 35mm in a traditional way are going to have a hard time looking at either of the Canon 35mm offerings now.