My highest compliment was when a friend reported to me that when he played my demo tape to a friend, the friend apparently exclaimed enthusiastically "Dusty Springfield!" when he heard my singing voice. I could never claim that's accurate, but the idea that somebody thought I sound like that, well, I will always treasure that. Another person came up to me after a gig I had played and said "you sing like an angel."
On the downside....another person reported that when he stuck my demo tape in the player, his wife said "That's not her. That can't be really her. " She didn't like me much already, so I got the impression it wasn't a "Wow!" positive reaction but likely more said in derision....My speaking voice doesn't sound like my singing voice but still, it was typical of when people haven't believed I'm capable of something actually good. I try to remember the genuine compliments and the nice people who seemed to really enjoy what I did.