Future Weapons - T-50 & J-20 vs F-22 & F-35

In the near future the F-35 Lightning II & the F-22 Raptor will take on the Russian Sukhoi T-50 PAK FA & the new Chinese 5th generation fighter Chengdu J-20.which fighters are superior? who has more firepower?is stealth really the key component to secure control of airspace?will the Russian PAK FA & the Chinese J-20 be a worthy adversary for the american F-22 & F-35?