KSE1200 is damn good. Love it to death. Really full bodied while maintaining a ton of detail, and incredibly sharp attack (a.k.a. fast transients). A pretty rare combination.
I don't have other HiFi class IEMs to compare them to, since it's the best i have. But I will confess that for sheer sharpness of attack, that distinctive cliff at the beginning of each note or percussive hit, to me anyway, it doesn't "feel" quite as quick as the Utopia, Stellia, or SR009s.
So, these are definitely up there, and these are among the last pieces of audio gear I'd ever be willing to give up if ever desperate. But... as amazing as it is, I'd say that it might not be as big a "revelation" as some might think.