Can’t judge Utopia, having never listened to one. I just know that Stellia is like heaven to me, but I come from cans belonging - let’s say - to a level three layers below, so my judgement is what it is.
The only thing that matters is that for me this is it!
I agree with you on the Stellia headphones. On the overall portrayal from either headphone, one does detail extraction slightly better (Utopia), and the other offers a more natural FR and wider soundstage (Stellia).