I would recommend this lens, it is very sharp at wide open with slightly blur at the corner, and already extremely sharp entire the frame at f4.
see big file here..http://www.pbase.com/chounws3/testing_zeiss_25_f28_zm
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| at f4. iso 200, 1/1250s |
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| at f2.8, iso 200, 1/2000s |
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| at f2.8, iso 200, 1/800 |
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| at f2.8 iso 200, 1/4000s |
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| not sure which f stop been used, iso 200, 1/800s |
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| not sure which f stop been used, iso 200 1/320s |
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