The PAK-FA is bigger than the Super Hornet in ever dimension. Length 5.9 Ft Longer, 1.2 Ft Wider, 3.8 Ft Taller. Then let's not forget a 32,000/66,000 lbs (Empty/Max) vs 40,785/81,570 lbs. (btw the Naval Variant of the PAK-FA would be even heavier!)
In short the massive PAK-FA would be a...