Congrats! I really hope you enjoy it too.
Again, the caveat that it's still very early, and it could be possible that the sound signature of the X, or more accurately my impressions of it, may evolve.
That said, here's what I hear on Day 4.

The Asgard X is warm, but not overtly so. Class A on solid state, when done properly, is really clean and articulate to me. I haven't heard Mjolnir 3 yet, but some have said it has quite a smooth presentation, but I've never heard it characterized as "rolled-off" before. That's not my impression of the Asgard X. Mine likely leans warmer than the baseline because I've listened exclusively paired with my ZMF Bokeh Closed headphones so far, and they have a very warm sound signature. The two of them together indeed create a warm presentation with pronounced bass but I don't hear any deficiencies in the treble. Note: I'm a little treble sensitive so I try to tailor the sound away from anything overtly bright.
I've heard one person tell me who owns both that the Pietus Maximus is warmer than Asgard X (which probably isn't surprising given its Programmable Output Stage), but since I've not heard the PM I can't make that comparison myself.
I'll try it out with other headphones, likely with a more neutral set, to see how that changes the equation, but I likely won't have much time to do that until this coming weekend.
Once yours arrives and you have a little time to acclimate to it, do share your impressions as well. I'm curious how it'll work for you in your setup with your headphones.
Happy listening!