PAK FA (T-50) estimated specifications made in 2009 - very similar to http://en.wikipedia.org/wiki/PAK_FA#Specifications now that PAK FA has had semi-public test flights.
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Robert Farley for The Diplomat, January 23, 2014 reports http://thediplomat.com/2014/01/the-hard-politics-of-fighter-aircraft-india-russia-and-the-pak-fa/ :