If I bought the Utopia, I know I would end up buying a Moon Audio Black Dragon Utopia V2 cable. Adding another £400-£500 to the price.
If I bought the Stellia, I might be tempted to buy a slightly brighter cable. Although I doubt it. I am just not sure. It actually trailed through most of the review today, and very few mention Stellia treble. They all talk about the Stellia bass.
There was one or two reviews that mentioned the Stellia treble though, and they say it's crisp and clear. One mentioned treble air. Another said the treble was nicely balanced: no brightness or glare, while not being dull.
It's possibly probably what I am looking for. I have the AKG N5005, and I like their signature.
I'd like to be as neutral as possible, but lean slightly warmer if either way from neutral. (That's why I know I would end up buying another cable for the Utopia.) The slight dip around 8KHz on the Stellia gives me a little pause for thought though. How could you buy a cable to counteract that? Never going to happen.