I'm not surprised that the spitfire was a better dog-fighter than the mustang due to less weight and better wings. I'm not sure about the turning capabilities of the p-51 vs the bf-109 but I do know the bf109 wasn’t a great turn fighter. The p-51 taken with all it's benefits combined with the better range might be considered a better fighter than the spitfire. The latter Russian Yaks and la-5s were great fighters also. Thanks for commenting!