I also consider the Q701 the non fatiguing K70X
Anniversary if you're ultra sensitive to upper mids and treble.
The only way the Q701 could bother me on a transparent setup is if I was listening to the harshest and most poorly recorded music ever for about an hour straight.
It doesn't "fix" it by recessing the upper mids and treble. Even if there was no upper mids peak it'd still sound bad.
Luckily only about 5% of my collection is that bad. Some random Jpop I almost never listen to.
The upper mids peak on the Q701 is very minor to me. The one on the K702 drove me nuts.
If anyone ever gets fatigued by the Anniversary it would be from the lower mids or bass.
I've actually gotten fatigued by bass before! Not sure what headphone it was, but that almost never happens.