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.
Good luck!
https://positive-feedback.com/reviews/hardware-reviews/focal-utopia-abyss-phi-cc-hifiman-susvara/
Good luck!
https://positive-feedback.com/reviews/hardware-reviews/focal-utopia-abyss-phi-cc-hifiman-susvara/