The IT01 was a more bass heavy. While the Comet is not lacking bass, there is less of it than the 01. The comet is more precise, bass hits are solid, no bleed over. The mids were very nicely presented with great detail. Comet, to me, was more neutral to bright than the 01. Maybe just the presentation of the BA vs the DD? I have nothing disparaging to say of either. Liked them both, just for different reasons. I would not have jumped on the Comet but the younger son needed an IEM and that was the one I could easily replace.
TLDR, the Comet seemed more detailed and clear and bright. The IT01 seemed more warm and rich. Not an apple to apples comparison because of driver differences and implementation. Both good choices.
Need to put a caveat in here, I only heard the Comet for about an hour last night so the impression is preliminary.