INDIANAPOLIS — I once had a rousing debate with a respected General Motors PR rep about why Cadillac could never seem to compete with the Germans. There have been exceptions: The original ’76 Seville, ’92 STS, and any number of V-Series among them, but as a whole, Cadillac never quite got there. And worse, it seemed Cadillac was ashamed of its heritage as it tried to become an American BMW. Well, there are no more excuses. The CT4 has finally beat the Germans without selling its soul.