I wouldn't say quite that. There are 3 weapons that are very, very comparable and they are all gotten with different paths.
Getting all 12 Atmas doesn't make you the "best" player.

Here's an example:
http://xivdb.com/?compare/items/7835-7814-7286
All iLvl 100.

As a matter of fact, when all is said and done (at least until 2.3), the Animus weapon is actually 3rd behind Allagan and Non-Weathered.