This is exactly what I often think, but these doubts disappear after listening a couple of hours to the Shure........ I had here an HD800 brand new that I could source really cheap. After decent period of break-in I paired it in balanced mode with my HD53N and tested vs. SRH1840, again and again, a/b tests more and more back and forward .... until I gave up. It is a tremendous headphone but it gave me nothing I haven't heard before, everything was more than just accurate, everything fine, every note where it is supposed to be, but it did not caught me, nothing was really emotional, it did not take me away like the Shure does. I was even biased to see the HD800 in front in terms of stage and scene because of the value, the money it costs, etc., nothing helped, I had to surrender, I sold it ...........
But lamentably I did not learn so much from this episode
.... I am now in the process of breaking-in an HE-560 just out of curiosity, if something could be out there (maybe in planar's world?) in the range below €1000 that gives me more than those SRH1840 ......... will see!