The F-35 is a multirole aircraft, so I guess the "Sukhoi able to take them down" comment could be in straight up dogfight manouverability. It's not an air superiority fighter, it's a CAS/strike fighter. The F-35 instead relies on electronic IR sensors to maintain full control of all targets and missiles around it, I think there's some Northrop Grumman quote where they said "manouverability is irrelevant" with this aircraft.
As for the maintenance costs, the F22 stealth material is far more brittle than the one used on the F35. Think so