Interesting.
You know one reason I thought the Mg might get trashed is because a lot of people are very used to the OG, or in love with it. It's very easy when one is accustomed to a certain signature, that when presented with that same signature slightly modified, to call it wrong, or off. I think this is much more likely to occur between similar headphones than dramatically different ones. It seemed odd to me that focal would produce an inferior revision, to be honest, I don't believe it. They make such superb products it would at least be a sidegrade.