Summary
Sigma 17-50mm f/2.8 EX DC OS HSM lens review - Sample Images: Sharpness Tests

Here we have the image (reduced in size) showing where the following centre and edge crops were taken from. We've reproduced all of these crops at 100%.
CENTRE SHARPNESS
f/2.8 @ 28mm
f/3.5 @ 28mm
f/5.6 @ 28mm
f/8 @ 28mm
f/11 @ 28mm
f/16 @ 28mm
f/20 @ 28mm
f/22 @ 28mm
EDGE SHARPNESS
f/2.8 @ 28mm
f/3.5 @ 28mm
f/5.6 @ 28mm
f/8 @ 28mm
f/11 @ 28mm
f/16 @ 28mm
f/20 @ 28mm
f/22 @ 28mm
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Sigma 17-50mm f/2.8 EX DC OS HSM FLD Standard Zoom Lens for Canon DSLR Lens Kit
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Sigma 17-50mm F2.8 EX DC OS HSM Zoom Lens for Canon w/ 3 Piece Filters + Case
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Sigma 17-50mm F2.8 EX DC OS HSM Zoom Lens for Nikon w/ 3 Piece Filters + Case
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Sigma 17-50mm f/2.8 EX DC OS HSM FLD Standard Zoom Lens Canon DSLR - Pro Lens Ki
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Sigma 17-50mm f/2.8 EX DC OS HSM Zoom Lens for Pentax DSLRs w/ APS-C Sensors NEW
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