This isn't totally cut and dry but:
Quantity:
Eikon < Ori << Atticus
Quality:
Atticus < Eikon < / = Ori
Ori, well driven with a powerful solid state, has near perfect bass in terms of quantity and quality, IMO. Eikon has a similar level of quality (just behind it, IMO), with a pinch less midbass and a pinch more subbass. It has a really great level of quality with pretty good tightness and only enough extra decay to make it fun. Atticus has the most midbass and the most bass overall. I've found the bass varies on Atticus quite a bit by the amp, but paired with a good tube amp it gains an impressive level of quality with an explosive dynamic potential that would make a Fostex blush.
This Q/A is one of the big issues I have in mind about waiting for an Atticus >6 months from now (because I hope that different woods will be offered) vs getting an Ori right now at discounted price. It's making me a little crazy: if I get the Ori, which I've wanted for over a year & would already have purchased if not for the launch of Eikon/Atticus, I probably won't get the Atticus. It's hard to justify owning both (at least on money grounds).
I'm pretty sure based on all the comments/reviews of Omni/Ori that the bass would be really excellent for me. But I also keep reading comparative comments about the better upper midrange and treble on Atticus/Eikon vs Ori (totally different drivers, and of course the A/E aren't Fostex mods)...and I just don't know how much that planar vs dynamic difference would matter to my ears.
I find the look of the Ori to be
extremely pleasing, particularly with my wood-of-choice (ormosia henri),
5 more days ('til end of Ori sale) to obsess over this...