"Britain's Defence Evaluation and Research Agency (now split into QinetiQ and DSTL) did an operational evaluation comparing the Typhoon with some other modern fighters in how well they performed against an expected adversary aircraft, the Sukhoi Su-35."
"The study used real pilots flying the JOUST system of networked simulators. Various western aircraft were put in simulated combat against the Su-35. The results were:
F/A-22 Raptor 10.1 : 1
Typhoon 4.5 : 1
Rafale 1.0 : 1
Su-35 1.0 : 1
F-15C 0.8 : 1
F/A-18+ 0.4 : 1
F/A-18C 0.3 : 1
F-16C 0.3 : 1
"These results mean, for example, that in simulated combat, 4.5 Su-35s were shot down for every Typhoon lost."
"The "F/A-18+" in the study was apparently not the current F/A-18E/F, but an improved version. All the western aircraft in the simulation were using the AMRAAM missile, except the Rafale which was using the MICA missile."
"One must bear in mind that the full details of the simulation haven't been released, making it hard to verify whether it gives an accurate evaluation of the capabilities of these aircraft (for instance, whether they had adequate knowledge of the Sukhoi and Raptor to realistically simulate their combat performance)."
http://en.wikipedia.org/wiki/Comparison_of_2000s_fighter_aircraft