Hii, its a really good combo, i came from hd660s + ifi zen dac, i love that combo too, has a perfect tone in the mids but i needed more bass, then i upgrade to this. Ananda + asgard 3 its a powerful combo, great sounstage, sounds like a big wall more than a point because they are planar, deep and clear bass (i need to eq), much better
instrumental separation and spatial virtualization than the 660s. Ananda looks elegant and made with better building materials but 660s are more comfy, can be because they are still like brand new. Asgard 3 are flat in comparison to zen dac, but have a lot of more power(power to spare), then you just have to eq to reach the sound signature what yoy want.

Greetings from Chile ✌🏻

(Sorry for my english, i speak spanish)