Johannes Steinhoff was one of the great Luftwaffe aces and the leader of the 77th fighter group in the MTO. He was also one of the few officers with the balls to openly challenge Goring's idiotic leadership. Here is an interview with an interesting comment about the p-38. Probably he is referring to the G and H models he faced during combat over North Africa, Sicily, and Italy.
http://history1900s.about.com/librar...steinhoff3.htm
WWII: Of all the Allied fighters you encountered, which was the most difficult to handle with a good pilot at the controls?
Steinhoff: The Lightning. It was fast, low profiled and a fantastic fighter, and a real danger when it was above you. It was only vulnerable if you were behind it, a little below and closing fast, or turning into it, but on the attack it was a tremendous aircraft. One shot me down from long range in 1944. That would be the one, although the P-51 [Mustang] was deadly because of the long range, and it could cover any air base in Europe. This made things difficult, especially later when flying the jets.