QUOTE(Heirophant @ Mon 27 Apr 2009 0701)

Neither the F-22 nor F-35 can get a lock on the other, both being stealthy. No BVR engagements, and heat-seekers aren't too good either.
Much of this is just speculation since we don't know the actual capabilities, but I wouldn't count on especially F-35 being immune to detection and engagement by F-22 radar at shorter (but far from cannon) range. Also, WVR any AAM with FPA seeker should most likely engage both planes without problem, and given any side angle to show bits of the rear fuselage, 80's era gas-cooled InSb reticle/rosette scanning seekers would most likely track fine also. An open question is the level of IRCCM, but I'm unaware of either plane being about to get any sort of DIRCM, so that would probably leave both vulnerable to each other's AIM-9X shots on the merge. And once you maneuver to the opponent's rear hemisphere, then for sure.
QUOTE(Heirophant @ Mon 27 Apr 2009 0701)

Analogy: In a World-War 2 dogfight with machine-cannons, why hava a larger, more expensive plane, when a smaller one can do the exact same thing?
The smaller plane in this case has also considerable less thrust per weight by enough of a margin to give F-22 considerable advantage even if you assume a gunfight...