I've found this nice article
http://www.historynet.com/messerschmitt-me-109.htm . Just read the first few sentences
Few arguments are more futile–yet more perennially enticing–than the question of which was the greatest fighter of World War II. What criterion does one use to define 'great?' Performance? Versatility? Combat record? Don't ask veteran fighter pilots to settle the matter. They have their own opinions, best expressed by the late Soviet ace of aces Ivan Kozhedub's answer to the question: 'The La-7. I hope you understand why.' The Lavochkin La-7 was indisputably a great fighter. More important, it was his fighter.