Here is the Digital Picture’s review:
http://www.the-digital-picture.com/Reviews/Canon-EF-70-300mm-f-4.5-5.6-DO-IS-USM-Lens-Review.aspx

Here is the ISO 12233 charts on this lens sharpness and you can choose whatever comparator you would want with this lens. Check out the EF 70-200mm f/4L IS

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=243&desc=Canon-EF-70-300mm-f/4.5-5.6-DO-IS-USM-Lens-Sample-Crops

In the USD 1100 price range (I am assuming the same difference exists in BP) the new EF 70-200 f/4L IS beats the pants off the DO in sharpness. You will get close the 300mm (280mm) at f/5.6 with a 1.4x TC II (another $285). Or if you believe that its an FLM and not an FOVC then you are getting 448mm with a 1.6x crop.
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