Photographyblog Zuiko 50 200 review - Does it make sense?

Hello All,

I have been keeping eye on zuiko 50 -200 for sometime and reading some online reviews. I came across photography blog review

http://www.photographyblog.com/reviews/olympus_zuiko_digital_ed_50_200mm_f_28_35_swd_review/sharpness_1/

Their sharpness test did not make sense for me. If you see the image, it covers large depth and I am not sure about the focus point. Then they have shown center crop and corner crop. Both crops are in different depths. At f2.8 it makes whole lot of difference, considering the depth in the image. If somebody looks at the review first time they might think that it performs very bad with wide open. Has anyone observed this with zuiko 50-200?

--
Antony Vance