All new Camerton Audio Binom-ER headphones are out now
They sell them in the USA now
Utopia for a more all around boring clinical yet technical sound.
Abyss for a more exciting in your face high energy kind of sound.
Though worded as if Utopia is not as good, they are both good in their own right. Depends what you are looking for.
If you can demo, that is best, if you can not, consider the gear needed as well, Utopia needs less powerful amp!
Pretty much every reviewer mentions just how well built the Focals are. Also the Abyss 1266 is indeed quite a bit more difficult to drive than the Focals. It's something regularly discussed on Abyss threads. Focals are 104 dB efficiency and the Abyss 1266's are 88 dB efficiency.
The Abyss are a little more "speaker like" in presentation. The Utopia has a smaller sound stage, but imaging is still very good. The Abyss is a little more accurate at resolving midrange...while the Utopia has outstanding treble resolution. Although the Utopia can resolve different styles of bass with accurate tonality, tonal changes do occur when things get complex. So if I were you, I would go for the Abyss. The Utopias are also kind of fragile...unlike the Abyss which is literally a tank in the form of a headphone.
They're both easy to drive with a decent headphone amp. No need for lots of power like the HiFiMan HE-6s.
Hope this helps you choose.