Canon 18-55 f3.5-5.6 vs. Sigma 18-50 f2.8 EX DC

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Shot with an EOS 400D hand held, with ISO 200 in RAW, processed with DPP 3.0.
So not a totally reliable test concerning focussing, but good enough to give an impression.
First both at 18mm, at f3.5 and f8. Then 35mm will follow, and after that 55/50mm.

First, Canon 18-55, 18mm at f3.5. Not correctly in focus, instead of the white letters the upper corner is in focus.

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Canon 18-55 at 18mm, f8

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Sigma 18-50 f2.8 at 18mm, f3.5

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Sigma 18-50 f2.8 at 18mm, f8.

35mm samples to follow in a while.

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Canon 18-55 at 35mm f4.5

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Canon 18-55, 35mm f8

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Sigma 18-50 f2.8 with 35mm, f4.5. Clearly I was further away from the subject, oops.

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Sigma 18-50 f2.8 at 35mm and f8

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Canon 18-55 f3.5-5.6, 55mm, f5.6

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Canon 18-55 f3.5-5.6 55mm f8