Personally for me the Sundara feels like a teaser before the real end game. Everything sounds very good and natural but I feel everything could be better. But I'm done with the Sundara because there is no reason to spend more than 350$ for headphones overall. If you have enough resources, you may try something different, but correlation between price and sound quality is gonna be far from the optimal. Maybe Edition XS is worth the money and very good for the price but I haven't tried it and won't do it.

I heard an interesting opinion that people who buy flagship items are mostly investing directly in the company and their future products. If you like HifiMan and want to support them, something like Ananda or Arya would be your next end game.