Thanks to an oversight on my part in not taking along appropriate connectors (if you're going along with your own source, don't forget) I wasn't able to hook up my X5 to the Hugo so had to make do with unfamiliar high res music streamed from a laptop - but it sufficiently piqued my interest enough to book a return visit suitably equipped.
That said, it's pretty clear the K10's are the real stars, & plugged into my own kit made it very apparent just how good they are. The X5 can be a bit rough with treble on occasion, but (partnered with an E12 amp) through the K10's it's spectacularly good. It's a total cliché to say it, but in a way I've never heard before, the K10's highs are genuinely silk smooth with absolutely no grain at all, topping off a lovely balanced, full-bodied, full-scale soundscape. Yes, I'm smitten - better start saving.
The oddest part of the experience is that despite being totally taken with the K10's and having the desire for ownership set in place, I came away feeling even more content with my N4's as, whilst being quite obviously less capable than their big brothers, making a direct comparison demonstrated how exceptional they are at their price point.
Cracking afternoon it was.