Su 35 in foreground - a PAK FA (T-50) behind it.
Back in 2012: Interesting photos and comments particularly about South Korean interest in the PAK FA and the broader prospect of the PAK FA competing with the F-35 (JSF) for export orders.
http://defensetech.org/2011/08/15/fighter-porn-russias-pak-fa-stealth-jet/
Since 2012
Overall Vladi the Poisoner Putin has blown too much money on power projection in Syria and Putin's Nuclear Wonder Weapons (Doomsday Torpedoes?) for Russia to also afford to develop 5G airecraft like the PAK-FA.
India, for its part, has played less of a part in throwing money at the PAK-FA Project given Putin cannot throw his weight around everywhere in Russia's over-extended military-industrial complex.
Also Putin, noting pensions are harder to get, is increasingly concerned with his Palacial legacies.
Pete
Pete