i have the emx 500 , R4YS and graphene mx 760 ( new version blue cable)
as far i am concerned.. the first 2 are somewhat similar but the R4YS has better clarity and wider soundstage and the emx 500 has better depth soundstage . in terms of bass they are both somewhat the same but better in their own ways.. if u prefer sub bass to mid bass then emx 500 is better but overall R4Ys has better bass throughout the soundstage and also has some sub bass..graphene is a different sound signature though... its tuned more towards impact weighty thick sound and depth soundstage and doesnt have the excellent articulation ( the flow of sound from top to bottom) of the emx 500 or R4YS...
But the graphenes will articulate more in terms fo forward backwards depth.. if u are mainly a concert, classical theatre hall music listener then the graphenes will do better.. than the other 2... or if u always listen to high res sources of this sort
For movie watchers, everyday youtube and mp3 or processed music or synthesized, emx and r4Ys is better...