As was Otto Carius (Author of "Tiger im Schlamm"/"Tigers in the Mud")...
http://en.wikipedia.org/wiki/Otto_Carius
...and Kurt Knispel...
http://en.wikipedia.org/wiki/Kurt_Knispel
And by the way the most successful tank ace, as last as I remember it, was Kurt Knispel (Wehrmacht). But he wasn´t much liked by the leadership because he refused a few times to obey orders (for example he should have attacked an officer who mistreated soviet POWs). But his outstanding combat performance rescued him all the time before harsher penalties. So he was ignored for awards or suggested promotions. And nevertheless he got at least the German Cross in Gold in 1944. And another hint by the way - he was nicknamed The Black Baron after the fighter Ace Manfred von Richthofen in WW1.
Wittmann was a better propaganda. And if I´m not totally mistaken Whittmann got outstanding numbers of destroyed enemy AT-guns (132 ???). There was no one better.
And there we are again - it´s always a thing of the angle You see who´s best etc.
Greeetings
List of most successful german tank aces:
1. Kurt Knispel –168 (sPzAbt. 503)
2. Otto Carius – 150+ (sPzAbt. 502
3. Johannes (Hans) Bolter-- 139 (möglich 144) (sPzAbt. 502)
4. Michael Wittman – 138 (sSS.PzAbt. 101 Leibstandarte)
5. Hans Sandrock – 123
6. Paul Egger – 113 (s SS Pz. Abt. 102)
7. Fritz Lang– 113 (StuG. Abt. 232)
8. Arno Giesen – 111 (Das Reich)
9. Oberfahnrich Rondorf—106 (sPzAbt. 503)
10. Feldwebel Gaetner ( Gartner?)– 103 (sPzAbt. 503)