I just got it for less than a week though but "underwhelmed by it"? What exactly did you find wrong with it cos I do want to know. I own the HD800 as well.I had it a few months back, and was underwhelmed by it. Sold it. Granted that time I did not have the Utopia. I had the HD800
I found the bass more pronounced on the Audeze with my Focal cans which is why I selected it over the Ragnarok. The impedance of the Utopia is 80 ohms whereas the HD800 is 300 ohms.