The question actually asks many questions about the different F4s. Which was best, hard wing or soft wing? Which models had a slotted stabilator and what did it do for performance? Was the K the only model with drooped ailerons and could they be used in combat? Was the K also the only model with rapid reheat? I know that the J79 reheat lit quite quickly. The debate between J79 and RR Spey has been aired many times. Why do USAF models and their derivatives have less sturdy landing gear and smaller tyres.
Then of course there is the weapons system. Having operated Ds and Es as well as the M there is no doubt that, in the right hands, the PD radar was way ahead. I was appalled to hear when at Yuma that only 2 RIOs on MC Sqn could operate or understand PD, the rest just used Pulse.
The Digital Radar in the E model was an improvement but it still had all of the limitations of pulse. The weapons upgrade in the F made it credible to go on into the 90s, a shame the display wasn't better.
Any thoughts out there?