Wauw, that's new to me...
Anyways, I hope you will like the 750's. They are truly amazingly lovely but I would prefer the ed9 over them any time.
On one hand though, IF there are significant cosmetic upgrades to the Ed 9 (and of course there are...SIGNIFICANT ones), it might be reasonable to expect those creature comforts to add to the placebo effect...even beyond the knowledge of the huge jump in price.
...but I digress.