Actually the P-51 was outclassed in kills by the P-47. By the time the P-51-D arrived in Europe the P-47 had already broken the back of the German Luftwaffe. The pilots the Germans sent up were novices with few flying hours flying BF-109G6 / K models that were considerably outclassed by the Mustang. Easy kills in other words.In sheer number of aircraft kills the Messerschmitt BF-109 holds the record until this day. No other aircraft in history shot down so many enemy aircraft as the BF-109. Impressive for an airplane that many aviation experts considered obsolete by mid-1942.