First of all we all express our personal opinions here. In my opinion even the Serenity SE is better than Stealth Indra in terms of tonality and neutrality. Indra sounds like it has a peak in 4 KHz that makes it irritating for my ears in the long term. That is probably the reason you see so many Indras sold in the second hand market.
If the Serenity SE performs like that then I imagine the Argento Flow will eliminate any possible competition. People in Honk Kong (check the Audioexotics Forum)have compared the new Argento Flow with Stealth Indra, Jorma Design Prime and Siltech G6. They said all the other cables didn't stand a chance against the Argento Flow. And these guys have some super systems....