I think Jon Hamm's closer to a William Holden type, in that he's charming and handsome, but tends to put his handsomeness to use in a slightly "sleazy" way (see Sabrina/Picnic for Holden, Bridesmaids/etc. for Hamm) for comic/dramatic effect. I.e. his characters are often clearly seducing a woman, while Grant/Clooney…