I've known people like characters on every show I've listed. The characters are, of course, exaggerations. That's what makes it comedy. But we all know people like Jack and Mary and Don and Dennis and Phil and Rob and Laura and Cliff Huxtable, etc., etc., etc.
Taking a slightly different tack on this, I've always thought that Jack Benny's character straddled two usually distinct genres of great sitcom characters - the ones who you would like to be friends with in real life - like Bill Cosby, Mary Richards, or Rob Petrie - vs. the ones you would LOATHE to be friends with in real life but love to watch anyway - a Basil Fawlty, a Fred Sanford, or an Archie Bunker. IMHO, it's a much tougher conceit to pull off an unlikeable lead character - but when it works right, there is nothing better. Interesting how Jack successfully combined these two approaches, I can't think of another comparable example.