Quick comparison to some other cans: Audeze LCD-2s, Sennheiser HD6XX, & a pair of lightly modded Fostex T50-RP Mk3s (all driven by a Modi 3 & Magni Heresy), and I can compare it to my recollections of the XM4s, that I no longer own, and the Sennheiser Momentum 2 over-ears.
So to start, these aren't completely neutral. There's a bit of fun to them, but it's nothing like the XM4s that had that fairly huge boost to anything below 120Hz. Sound-stage wise, these are some of the most impressive closed-backs I've tried. They're pretty equivalent to the Fostex in sound signature: A little bump in the bass but nothing silly. There's a bit of sparkle in the cymbals but nothing ear-piercing. They sound better than the Momentum 2s, and I actually prefer them to the Fostex. I like them about as much as the 6XX, which is saying a lot. They sound a lot faster than the 6XX too, although not as quite as fast as the Fostex.
If I were to sit and listen to a full album in my arm chair just for the album, I'd pick the LCD-2s over these pretty handily, but those are decidedly non-portable.
Fit and finish wise, they blow all of the above out of the water. They feel significantly more premium than any of the above, and are more comfortable than any of the above headphones.
ANC wise they easily best the Momentums. They're pretty equivalent with how I remember the XM4s. They're definitely no slouch. Transparency mode on these is also just 100x better than it was with the XM4s -- everything sounds a lot more "natural" in transparency mode. Better than the AirPods Pro, too, so if transparency mode is your jam, these things are top tier.
I'm probably going to end up wearing these things for 8 to 10 hours every day. I'm pretty happy with the purchase.