To add to the WW2 examples - The German Bf-109 wasn't the best fighter of the war by most standards, yet it got flown by arguably the best fighter pilots in his

To add to the WW2 examples - The German Bf-109 wasn't the best fighter of the war by most standards, yet it got flown by arguably the best fighter pilots in history (thanks to the insane Luftwaffe policy of keeping the best pilots on the front line in perpetuity), and so is responsible for more aerial victories than any other aircraft. Also small, also cheap, and the Germans built scads of them. You could really see the difference in training and experience, however, toward the end of the war, where badly trained German pilots were thoroughly outclassed by their Allied opponents.