So, I now have them both in hand, though I haven't opened the Pi8 yet. I am SO impressed with the AZ80 I would be SHOCKED if Pi8 measures up. Giving it a week or so with Technics before I do a proper comparison, though. Based solely on AZ80 I am seriously wondering if the best-of-the-best TWS are now on par with similarly priced chi-fi IEMs?

The sheer bass dynamics still lag behind a bit, but that's something that will only be solved by a seismic leap in battery tech.
This is also what I thought - the 3.5mm out supports aptx adaptive, usb-c to usb-c supports aptx lossless.
Either way, AZ80 supports
LDAC which I think is higher bandwidth than either?