Although the Ki-84 is one of the three planes that can beat every prop plane in game if flown properly.
Ki-84, F4U-4, and Spit16 will outfly practically everything else assuming the pilot is top notch, though I've yet to see the "mythical" unbeatable pilot. (yes, I've heard about Kazaa, Grizz and others, I just haven't seen them
).
Aircrafts that in real-life could outfly (I assume here meaning out-turning in some form) any other are probably not the ones everyone expect, and certainly don't include real-life boom and zoom obsessed specialists like the Spitfire... (That is, if you have read any number of mid-late war Spitfire combat accounts: The Russians tried to remove the outer machine guns to help it match their usual horizontal turn tactics, to no avail, and then had to boom and zoom with them just like everybody else: Source: "Fana de l'aviation" #496, p. 40).
As for the Ki-84...:
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"Aeroplane" November 2005, "Ki-100 fighter Database" p. 61-77. (16 full pages on the Ki-100, with remarkable details, including on the development of the projected high-altitude turbo-charged variant)
Quote : P. 76:
"At these schools, the cream of the IJAAF's instructors, all very experienced combat pilots, would give their opinion on the new fighter (Ki-100). Almost all the Akeno instructors were graduates of the 54th Class of the Army Air Academy and also highly-qualified sentai commanders in their own right.
During March and April they would fly the Ki-100 in comparison tests against the most capable Japanese fighter then in service, the Ki-84 "Frank". After extensive testing the conclusion drawn by the Akeno pilots left little to the imagination.
In short, it stated that given equally skilled pilots, the Ki-100 would ALWAYS win a fight with the Ki-84 in any one-to-one combat. They further added that in a combat situation with up to three Ki-84s, the Ki-100 pilot could still develop the battle to his advantage.
The results of the evaluations at the Hitachi school were just as clear-cut. Captain Yasuro Mazaki and captain Toyoshia Komatso,also both graduates of the 54th class, developed the combat evaluation situations for the new fighter, and in order to give an unbiaised opinion of the aircraft, they swapped aircraft after each engagements and attempted combat from the opposite standpoint.
In the first combat the Ki-100 was flown against a single Ki-84 with the Ki-100 winning outright.
Mazaki stated: "When we entered combat with the Ki-100 taking the height advantage, the Ki-100 won every time. Even with an altitude disadvantage the Ki-100 could hold down the Ki-84 in two or three climbs during the exercise"
He added that the Ki-84 was "only superior to the Ki-100 in diving speed. The Ki-100 was much better in the turn and while climbing."
P. 77. "The maneuverability of the Ki-100 was the best of the Army's frontline fighters with the exception of the Ki-43... And it had a strong advantage in that even less experienced pilots could fly it easily and fight with it."
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So much for the predictability of real-life outcomes...

Gaston