That is a good question. Let me start by framing where I am on the audiophile spectrum. I'm a bit of junior intermediate, there are people here who are far, far, more sophisticated than me. So, I have a basic understanding of this stuff, but generally I know what I like with sound and can play around with settings to find what I like. And I'm a bit of a gearhead, but not too tricked out.
So, I tend to like a bright sound and I'm not a huge fan of base. I listen to a lot of Rock, Jazz, acoustic, and classical. I don't really do hip-hop or electronic.
I'm a huge fan of the Sennheiser MTW line. I owned all three generations. They were my go-to for years. I had the Sony WF1000XM4's but always grabbed my MTW3's. I thought they sounded better and in every timeI did a comparison I always ended up with the MTW3.
I knew the new Sony's were coming out and my Sony's broke, so I got the replacement and sold them waiting for the XM5's. I bought the new Sony's and given that the AZ80's were out, I figured I'd do a bake-off.
Then, I lost my MTW3's. So, I bought a new pair and played around with the settings again. Compared to the Sony's and AZ80's they sounded a just a little less clear. I fooled around with the settings, because they did not sound as good as the AZ-80's or Sony's. And they did not sound as good as I remembered them no matter what I adjusted. And I also wondered if I had a new baseline from the sound quality of the other two earbuds I was testing too. In any event, the bottom line is they sounded a just little less clear compared to the other two.
But I have super high hopes for the MTW4's.
![Headphone Smile :) :)](https://cdn.head-fi.org/e/headfi/smily_headphones1.gif)
Next spring.....right?
As for comparing these three, here is my take.
Sony's - most comfortable, super clear sound, can't customize whats tapping on the earbud can do (you are stuck with Sony's choices). The sound stage is NOT as full as the AZ80s. Pretty cool equalizing tool and you can get it to sound like you want. Very good ANC. Most comfortable of all the ear buds. Mids and Highs are better than the XM4 - this was really the only sound improvement from what I could remember of the XM4's.
AZ80 - Super clear sound. These have the best sound detail of any of three I hear detail on these I don't hear on the others. Wide, and robust sound stage (this rocks!!!!) I like the app much better than the sony. ANC is very good, Sony might be just a better though. There a about few moments, I thought they sounded a little tinny, but I have the highs set to high.
MTW3 - Sound was not as clear as I liked. I always thought MTW3's did mids so well well and highs too, while I thought the Sony XM4's kind of failed at this compared to the MTW3s. But now the AZ-80 and new Sony's are doing mids and highs so well. I think the app is poorly designed too.
They are all great earbuds though. I don't think you can go wrong with any of them. I'm still a little back and forth on whether the AZ80's or Sonys will be my go to. I figured I'll see which one's a tend to use.
Hope this helps.