So by 1944 the Ki43 improved into an aircraft that was equivalent to a 1940 Mk I Spitfire or low dash Me109E?Ki-43 went from:
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Ki-43-I Two blade variable pitch prop, no armor no self sealing tanks, Ha 25 940 hp with pair of exhaust stacks, single speed supercharger, typically two 7.7mm machine guns (sometimes one 7.7mm and one 12.7mm) and a periscope gunsight. 308 mph. This was only gradually replaced from mid 1942.
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Ki-43-II Three bladed prop, Ha 115 1,130 hp engine with two stage supercharger, pilot armor, two 12.7mm machine guns, reflector gunsight, larger canopy. 330 mph This version appeared in later 1942.
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Ki-43-III as the -II but Ha 115-II 1,230 hp engine with water methanol and individual exhaust stacks, better self sealing tanks. 358 mph. This version appeared in 1944.