The thing is that the 50% they have down is likely just the basic stuff. Oh look, they can get an Iranian-built airframe flying. Its the other 50% of the aircraft that turns it from just a high-speed single-seater into threat to something like an F-16, yet alone an F-22.
Consider, if they're having that much trouble building their own aircraft, do you really think they'll be able to make their own missles with effective guidance systems? What about useable ECCM's? AWAC's? JDAM's? Hows their night-flying equipment?
We've been flying at 1000+mph since, what, late 1950's? F-22 went into service in 2005, right? JDAM's came around in 2000? It took us around 50 years to go from 1000+mph fighters to where we are now, and thats without sanctions in place.
Iran poses no credible threat in the air for the forseable future.