Couple of things:
It's not as if its 50% better, changes like this are always more subtle than that at this level of equipment and take a bit of time to discern. The Vega G2.1 is no slouch I must say, but there is noticeable improvement with the Tambaqui.
There is more detail in the decay of notes and other audio cues in low level detail. Imaging is more solid and defined. You feel as if you are far more "in the room" with the performers.
Timbre of instruments, particularly piano seems more real.
Very easy to listen to, no lumps or bumps. Engaging is a good way to describe it.
I do find I get better results using the Aries G2.1 for input using LDS rather than the Tambaqui as a stand alone Roon endpoint. Very satisfying.