Another review on the Lens from an Aussie Pro Photographer, Joshua Holko, some interesting comparison comments regards the 200-400 and the Series 1 300f/2.8 & 400f/2.8
http://blog.jholko.com/2013/05/14/canon-200-400mm-f4l-is-pre-production-sample-lens-review/
http://blog.jholko.com/2013/05/14/canon-200-400mm-f4l-is-pre-production-sample-lens-review/
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