Comfort: 10. I can hardly imagine a more comfortable over ear headphones... maybe ones with integrated cooling
Sub bass is good at higher volumes where it seems to really "kick in", but I don't miss it much at lower volumes either - might just be my hearing, though. I don't use any kind of EQ but I might try later, and I think you could trick the MIY app to EQ it for you the right way in the headphones
I also own a P7W and PX. P7W are more bass heavy, but much less refined in the bass region and the sound is more distant on them. Not sure I'd call that a larger soundstage because I don't think it's that beneficial. I like the P7W sound very much but the Amiron is clearly superior.
Compared to PX... well honestly I feel weird about the PX. When one gets used to them they have very clear and well defined sound, good amounts of everything. Objectively they should sound better but are less fun than the P7W. When I switch to them from the Amiron they sound all wrong and muffled for a while. And they are SUPER uncomfortable unless you have tiny ears. P7W aren't great either but whatever was wrong with their comfort is so much worse in the PX. ANC is "good enough" but the SQ takes a blow when you enable it - I only use it in the office, mostly for speech, but when I listen to music I switch the ANC off... which however makes them go to sleep (or rather turn off) every 2 minutes which is infuriating, silly, stupid, wt...
I owned Sony MDR-1000X (which could be close to the Sony you have somewhat? No idea...) and I found them absolutely terrible when it comes to sound - at high volumes there was heavy distortion - the likes you get when the amp is not powerful enough and is near clipping. The sound was uneven and very artificial. But they were also very comfortable (8? 9?) and had absolutely stellar ANC.
Really the only things that I find really wrong with the Amiron is the firmware, software and sadly also the bluetooth range. The app frequently loses connection, refuses to change settings with nonsensical messages, but luckily you don't need it after initial setup.
The firmware is quirky - for example if the headphones were on for some amount of time and you want to turn them on, you need to press the power button for 6 seconds. Then they turn off and turn on again, sometimes they switch to pairing mode. Clearly some timer keeps going on while that button is pressed when powering off, that should only fire when they are powering on. Also when connected for longer periods to time to one source, another source cannot be connected without first disconnecting the first one. But I had this happen with other headphones and is a common quirk. I don't like that they connect to the last 2 sources when powered on, but that's personal preference - I found the P7W to have the greatest implementation where they connect to the first _paired_ device, so you can have it setup and work reliably whenever and just connect whatever secondary source ad-hoc.
There's no feedback on connection lost and no way to disconnect sources from the headphones themselves (with P7W or PX you can press the button twice to disconnect which I use quite often, or press once to reconnect which is useful when you go out of range and then back).
Bluetooth range is bad. Some headphones I had were similiar (Sennheiser MM-550X), but I haven't seen anybody really complain about it. Take a look at the Aventho wireless reviews, seems like a frequent complaint here and probably the same electronics inside. Not sure to what extend BD were able to fix stuff. I don't use aptX because I find it inferior to AAC, and because aptX has bigger bandwidth it also has inferior range. I probably wouldn't be so critical about this if I never had the P7W or PX which have excellent range and stability (surpassed only by my Airpods that are Class 1 Bluetooth) but sometimes with interference it's a bit ridiculous to be just a few steps from the computer and having to turn the head the right way to keep the connection stable.
For their price, this should simply not happen. But if you want the superior sound then you probably need to account for diminishing returns...
