No, you definitely have not
But, my friend, let me disagree with something you said: "GR07s do not truly excel in an given genre, but are very capable at decently rendering a much wider range". My friend, I have listen to pretty much every genre with both, and in my opinion the EPH-100's do render a much wider range better. If you don't like the EPH100's treble for jazz, you won't like the GR-07's treble as well.
Plus the EPH-100's do everything better, since the energy and emotion they provide, to the sub-bass, to the slightly more forward mids, to the soundstage, largely superior instrument separation, 3D imaging, etc. And I'm talking since jazz to Electro and all the rest in the between (Pop, Rock, Indie, Funk, Soul, R&B, Hip-Hop, etc, etc).
Not to mention Metal where they truly excel, some steps ahead the UM3X, due to separation. They do render anything just perfectly. The GR-07's in comparison do sound dry, lifeless, and many times, congested (Metal). I definetly place the YAMAHA's in other league. But thats why this is a forum, a place for discussion, as we all have our own opinions