So I've spent a good hundred hours or more with the PI7 in my ears, thought I'd give you guys some ideas, comparisons, maybe useful.
I currently own the Airpods Pro, which I have a/b with the PI7 on many, many occassions now, out of interest.
My last tws were the MW07+, which I recognised as flawed but still loved, and used for a long time.
I have owned the Senn Momentum 2 tws for a week.
My wired earbuds I've owned: Campfire Andromeda & RHA T20
So the PI7 sounds. Laid back, effortless yet powerful, they have a lot more oomph than the Airpods Pro and MW07+. I think I can say quite confidently that when played from an Aptx source the PI7 are considerably better in SQ than both the Airpods Pro and MW07+, which I personally set at a similar level to one another.
Song comparisons
Listening to Lana Del Rey & Aurora to test vocals/mids: PI7 mids are much more detailed, where the APP sounds flat, PI7 is fuller and more nuanced. Its night and day, PI7 produces vocals much better than the APP.
Electronic music, Grimes, Chemical Bros: APP gets really congested and loses control in My name is dark and busier tracks. PI7 maintains resolution and handles all sides of audio.
The only thing the APP win on is in some tracks they have a bit of a brighter, livelier sound, whereas the PI7 are darker. From an Iphone XS Max the Airpods are also louders.
***important*** PI7 are 15% quieter or so from an iPhone than an Aptx device. They also sound better from an aptx device, but its marginal.
Vs MW07+
Comparing MW07+ to PI7 (memory): Vocals were a bit grainy and strange on MW07+, PI7 blows them out of the water in this respect. Bass approach is very different, MW07+ has interesting bass, but I think PI7 is more controlled.
VS Airpods Max
These are my goto noise cancelling portable audio device. However, I've been using them less, and less with the PI7 in hand. The ANC on the APM is beyond compare, but I think the PI7 addresses two flaws of the APM: weak midrange, lack of musical nature, or 'warmth'. I find the PI7 sound a good deal better and my APM have been collecting some serious dust, sadly, as I find them insanely comfortable and convenient. But the sound just isn't there.
I tested the PI7 with an iPhone XS Max, an Xperia 1 ii, an iPad Pro and from the case. THe PI7 sounded the best from the case to iPad, then from the xPeria, last the iPhone.
Conclusion
These buds are superb, they're the second best IEMs I've tried. They're better than the RHA wired T20 by a good margin, at least from an Aptx source.
They're a LOT better than Airpods Pro & MW07+, there is no contest. Totally different leagues, to my ear. The other two have too many flaws to be considered seriously for audio imo, but the PI7 really do carve into wired audio quality, ousting the T20i which is a good wired IEM.