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Anonymous
>>118261
http://www.photozone.de/Reviews/Pentax%20Lens%20Tests/48-pentax/138-pentax-smc-da-50-200mm-f4-56-ed- review--test-report
http://www.photozone.de/Reviews/Canon%20EOS%20Lens%20Tests/45-canon-eos-aps-c/323-sigma-af-55-200mm- f4-56-dc-lab-test-report--review
(Note that the sigma was tested on a canon body, so resolution figures are not directly comparable)
tl;dr Pentax = fail
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