I don't understan..you want bass yet then you want neutrality..
The es700 has plenty of accurate bass larger/deeper in tone than a m80.
I had the m50LE and it was nice and I would say in comparison, the es700 bass is slightly smaller but not really less.
The m50 had a slight resessed mids but a larger stage like the m100. I still have the m100 as they changed after 1000hrs to a very good balanced can!
I still have my es700 because of the amazing lively mids so I took the drivers and transplanted into a slightly larger can for a reference sound.(!)
The stock es700 has larger bass than a jvc500 but not in "amount of bass" although it can easily be pushed hard.
I found the ws99 just a very little too dark or chocolaty for my tastes, although I loved them anyhow and even more so than the es10(!)
They had (ws99) an amazing ability to sound very lean and detailed until the bass hit!..
Then it was as if the floor dropped from under you(!) as it could scare you with the "realism" of it's bass..
But sadly the bass wasnt there as much as it could have been, and so you had to push it to impress you.
So you needed an amp to really shine.
The es10 didn't have this issue as it's bass was always showing off!
Just that the ws99 mids were more natural than the es10.
So now back to the es700.
They have the mids that the es10 should have had. They sound alot like a baby es10.
I only say baby because the es10 has maybe too prominent bass, and a slightly larger stage.
I say don't let anyone fool you about the es700 as they are my fav because of the lively sound and it is never harsh in treble.
The issue is the mids in general are slightly brighter and so much livelier so I would say 90% of music sounds amazing & 10% of bright music sounds magnified but still not bad.
I don't see any headphone in $150 price rance that can touch the es700 as it is a highly musical and detailed can that made onlyJapan and its sound beats out most other I have owned including the famous m80; dt1350; amperiors; esw9; es7; etc. Alot others and prob every other "on ear" can.(!).. Except for the es10;esw11, of course!!
The m100, m50 and other "over ear" cans have a larger soundstage so they have that advantage.
There you go thats what my ears tell me, of course your ears will differ