Tamron 70-300, 5D MarkII
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Actually it focuses faster and more surely in low light than the Sigma(I've owned both). It does have tons more CA and is less sharp over the outer 2/3's of the frame(35mm)Here's the correct link to the patent (the patent link above points to a 55-250mm patent).
The patent shows 10 elements in 8 groups, compared to the current 35/1.4L which has 11 elements in 9 groups.
I like my 35L, and I'd probably preorder a 35L II if/when one comes along.
What are the weak points in current 35L? I would like to add fast 35mm in near future.
Slow and poor low light focusing. It is after all much older technology...