The price has nothing to do with it... I dont feel the same as you with a 700 bucks system...
No headphone can beat a speakers/room at the top level...But top level system in a dedicated room are not so frequent..
But some headphone can rival this in their own way at a fraction of the price in my case..
Headphone and speakers will become the same on the same level only with a BACCH set of filters...
In the meantime i am completely satisfied with an headphone system that rival and beat all of what i listened to in any living room.. 😊
I spoke about good average system, Quad, Magnepan and Tannoy etc ... I never listened to very high end costly system in a dedicated acoustic room ...I tuned my own dedicated room and my headphone rival it because my speakers were good but average...
The acoustic revolution actually dated back many years ago already is by Dr. Choueri and BACCH filters... No more difference between speakers and headphone... Any other upgrade than this could be useless if not absolutely necessary... It is my opinion only for sure...
Then after Dr. Choueri BACCH , the difference from speakers and headphone is no more significant , save confort and group listening with speakers, not the soundfield...
Anyway my K340 give me already a taste of an "out of the head" soundfield...
Despite having, and enjoying my pretty high end headphone and amp system (Grado GS3000, Astell and Kern amp, about $3500 combined), they will never, to me, sound as good as my full system.