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Diglloyd Lloyd Chambers have done more testing between the Sigma and Canon (with a lot of pics) Here are a few of his many comments in favour of the Sigma lens.
"The Canon 35/1.4L has a lot of magenta/green “color bokeh” (secondary longitudinal chromatic aberration), and this lingers until ƒ/5.6 (and some violet fringing lingers even to ƒ/11). The Sigma 35/1.4 shows much less color error, and is almost neutral by ƒ/2.8.
As for sharpness, the Sigma 35/1.4 is superior over the entire crop at every aperture, and strikingly superior through ƒ/5.6. Towards lower left the two lenses show the least difference, but towards upper right the Sigma 35/1.4 is particularly strong compared to the Canon.
Observe especially that in the ƒ/4 and ƒ/5.6 range, the Sigma 35/1.4 is much sharper and shows a lower level of chromatic errors."
"The Sigma 35/1.4 is smoother and cleaner at wide apertures (much less secondary color). The Canon 35/1.4 looks nervous by comparison."
Thinking forward: the Canon 5D Mark III is only 22 megapixels. What happens when Canon delivers a 40-50 megapixel camera? With that resolution, the Canon 35/1.4L will deliver obviously impaired results (it cannot even perform to the needs of the 5DM3), and the Sigma 35/1.4 will show its limits but still offer a much superior image.
Adding in the superior color correction, the Sigma 35/1.4 looks like a winner here."