How do they compare to focal utopia?
The Utopia is good, better in many (reference) ways than the HEK v1 (I have not heard the v2 yet), but needs good amp as well. Less but way better defined bass (depth and extension is fine as well with right amps). IMHO also the mids and highs are more exact and more true to the timbre with the Utopia, but the HEK is musical and nice as well. Both have some hardness in the upper mids when compared to Stax Omegas, but both are better than the HD800 in that respect.
IMHO at the price of the Utopia one can get a musically totally satisfying system with the HEK, and also with the HE6.
The Utopia would likely last a lot longer than a HEK, though, so it depending on what time frame are we looking at, the Utopia might actually be worth the price.
I preferred both the Stax 007 and 009 over the Utopia, but I can understand why people would like the Utopia.