GregP
Major
There is NO fighter that is the best at everything.The Spitfire Mk. XIV was still the best, and the best dogfighter of the war.
They didn't produce the K-4 in large numbers, in any case the Merlin engined HA-1112 was the best 109..but we won't go into that, it didn't see service and it was Hispano built...for Spain...
The Spitfire XIV was powerful, climbed well, and turned well. It was NOT a long-range aircraft. Combat range was 460 miles, meaning it was not a London-to-Berlin airplane.
It also was not the best at absorbing punishment, no Spitfire was. It was NOT a good ground-attack airplane.
But, if you were going to do one-on-one fighter combat, the Spitfire XIV was an excellent choice. So was a Tempest. So was an Fw 190D / Ta 152 (not many Ta152s). So was a P-51H (not many in WWII). The Bf 109s weren't bad at all if you stayed slow, but got less good as you got faster. The F4U, particularly the F4U-4 (not too many on WWII) was as fast as any and could turn and fight with any of the above.
So, when you say, "it was the best," what aspect were you talking about? Can't be all aspects, and fighter versus fighter combat was not all that frequent. After daylight bombing was established and the Allies were at it, bomber escort was mostly of what a fighter was used for. 1000-bomber raids escorted by 600 - 700 fighters was the order of the day for most of 1944, and the home-defence Spitfire XIVs didn't see much one-on-one combat. It was usually in support of an attack mission of some sort. And if the Germans were diving from 42,000 feet into bombers at 25,000 feet, they were NOT easy to catch, rendering the Spitfire XIV's dogfighting prowess largely unfulfilled.
So, what exactly do you mean by "best?" Airframe performance? Armament? Speed? Dive? Range? Turn ability? Rate of climb? No airplane had it all, and there were quite a few that could match and beat a Spitfire XIV in many factors. About the only one it hardly ever got beaten in was rate of climb which, while important, wasn't nearly as important as other aspects, depending on the mission. As an interceptor, it was likely the best or near the top. But at other missions, maybe it was less than the best.