Personally I think that Office for Mac 2011 is light years ahead of iWorks. But OforM 2011 is quite old now when compared to its Windows cousin.
Office for Mac 2011 was released on October 26, 2010 and is currently on SP4. ( http://en.wikipedia....ce_for_Mac_2011 )
Conversely Office for Windows 2010 was released on June 15, 2010 and the suite is now on version 2013. ( http://en.wikipedia....oft_Office_2010 )
Has MS basically given up on it in favor of Office 365?