http://www.janes.com/article/58166/singapore-airshow-2016-analysis-pak-fa-s-asian-export-hopes-stymied-by-lack-of-fifth-generation-qualities
"Russian industry has consistently referred to the Sukhoi T-50 PAK-FA as a fifth-generation aircraft, but a careful look at the programme reveals that this is an 'in-name-only' designation. What qualifies a fighter aircraft as being a next-generation design is more than just having a stealthy-looking shape, said Lockheed Martin representatives."
(BTW,chinese label for J-10A/B/C, J-11,.. is 3rd gen , J-20&J-31 are 4th gen...while the french call rafale 5th gen if I remember rite. Gen-labelling all differ from nation to nation)
Though might be exxagerated, still will take the russians some yrs before quantity&qualilty put in place. As I said, hindus will buy f35. They just dont feel secure with chinese j-20,j-31 coming online.
I've an odd feeling my vision is coming through