tough preflop all-in call

I guess I was just thinking he could not of pulled off that with a worse hand giving his stats and my image at the time...Then I call anyways?PokerStove gives me 56% equity against AK But only 18% VS KK,AA So IF I felt he had AA,KK then is was a Donk move by me.Interested to hear what others have to say on this.