In this other Answers article, you can find some good points on Confluence and Sharepoint. However, this could be a bit old and Confluence/Sharepoint have introduced even more features in order to have a better usability for the instance. Also, there's another blog that you could be interested to take a look: http://blogs.atlassian.com/2009/03/comparing_sharepoint_to_confluence/
Hope it helps ya!
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