Well, the Yak is somewhat more maneuverable than it should be. Don't take this as a slam against anybody who worked on it, becasue that isn't my intention.
In real life, the Yak-25/26/27/28 series were designed as interceptors who's main targets would presumably be NATO bombers. Speed, range, and the ability to carry a large, heavy radar were the primary design considerations, and agility was sacrificed to achieve this.
In fact, the Yak-28 had structural problems and any sort of aerobatics was forbidden. I can't remember, but I think the G-limit they imposed was 3, to keep the aircraft form breaking up due to stress fractures.
The Aerofax volume on Yakovlev Twin-Jets is an excellent resource on these planes for anyone interested.