Ok how about its two seat derivative, the MIG-31 Foxhound then? I suspect (he says referring to his last century aerodynamic lecture notes from uni ) that the Mig 31 had slightly less performance due to the additional weight of a second seat and additional systems.
And as Barnstormer states, with the F.3, so in this case how would the F.3 fare against the Foxhound or for that matter the F-4J/K ,
Cheers