Sure, you say that now, but what about the Groundhogs?In a pub brawl I think the MIG 21 might be at a disadvantage. There's no room for manoeuvres. However if the fight spilt out into the car park the MIG will win most times. If a Police F4 Phantom fires a Sparrow missile from the supermarket car park the MIG is toast.
Only if a combatant thinks they can launch a first strike and win with no retaliation!!!