@Kjell
ATH CKS-70 do not compare, they're better, and the bass is very different.
The bass on the CKS-70 (from my brief listening session) seemed powerful and boomy, present, not high quality, but very much "there".
The bass on the FA Marcus is controlled and spatialized, not boomy, so it has one plus on the CKS-70, however it's not raw, present, or high quality at all, either.
It reminded me of an IEM I demo'ed in a shop at an airport, some unknown brand called brooks or brookstone or something, it had that processed spatialied sound too, and looked of similiar low build quality, I don't know how they achieve that sound (I'm sure it's in the FA Silver Bullet as well), and it might sound impressive to some users at first, but as soon as the emphasized and controlled bass has lost it's novelty you realise the rest of the sound spectrum is dull and LQ.
In defense of Fischer Audio the FA Una are pretty good, however. Good upper mids and very clean and well presented sound.