And? The Su-27 has been upgraded over the decades like the F-15.
Fact is, a 1990s era Block 50 F-16C (an agile multirole fighter) shot down a 1980s era Su-24M (a tactical bomber).
If slavs started talking about how a MiG-29 shot down Americas "most advanced aircraft", when it had just shot down an F-111, they'd be smacked down
>Worked up fighter with functional, intigrated weapons and a pilot with tons of stick time.
>Prototype with inappropriate engines and no integration testing done, flown by a pilot with fuck all flight hours.
PAK-FA obviously, because by the time it enters service all F-15 airframes will be rotten and unable to take off. The PAK-FA would just fly over the aircraft boneyard and bomb it with dumb iron bombs. Eventually on the third pass it'd get a clear hit.