Again, that doesn't make any sense. You first suggest that "the DT-880 ONLY go left/right", and now you're saying they keep things in the center. The DT 880's relative intimacy doesn't preclude an appropriate sound field performance in terms of left/right and rear/front projection. You seem to suggest that the DT 880s sound "mono" and I think this is severely inaccurate, beyond your several impressions lacking consistently and seemingly contradicting one another (though clarification on your end would be most welcome).
What upper-end headphones do you consider to be most accurate and correct? I think the HD 800s do much better than the Q701s at what the latter try to do, because they actually have accurate and precise imaging and possess central projection capabilities as needed. Things that should be in the center of the sound simply are. The Q701s lacked this centrality in comparison, attempting a needlessly cavernous sound field with the fatal flow of a central black hole. Using the HD 800 as a reference, the DT 880s sounded closer to its imaging specificity to me (while obviously lacking the famously diffuse sound field).