I use a sigma 70-200 f2.8 on my 1DsII. It's an excellent combination for general photography and fast sports where you can be close to the action. (I'm sidelined through injury for this season, but am having a lot of fun with the camera pitchside at my rugby club). It works quite well at the wide end for landscapes (although may not be wide enough on a 1.6 crop sensor), and as mentioned above, takes a 2*TC to give you a 140-200 f5.6 AF lens, still with reasonable focus speed. Colour and contrast is good, as is sharpness.
I have used mine side by side with a canon 70-200 f2.8L and there was almost negligible difference in IQ - certainly not enough to justify the price difference!
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