IDK, sometimes some headphones are "slow burners" as I call them. The Omega 2 was like this for me. When I first heard it, I thought they sounded really fantastic, but they didn't move me per se. It took a few weeks for me to discover their full charm.
Perhaps the HE90 is like that for you? Maybe if you lived with it for a while, you'd find you couldn't go back to anything else.
For me the HE90 was insta-WOW with just about everything I heard out of it. If I had a disposable 20k to invest in an Orpheus set I so would. In a heartbeat. If I found the HE90 on its own for half of that, I'd definitely consider it too.