Here is the truth, headphones in general should not be used for mixing. the imaging is totally different from speakers so unless you are mixing for headphones use speakers as that is what most people use to listen to music.
I have had a set of very high-end headphone here that a very good friend of mine brought over that through most of the range did not sound all that different. What headphones were these, The Stax Lamda Pro's. main deviation from these were the M50X's had slightly more bass & the Lamda Pro's were smoother at the high frequencies I.E. less sharpness. The M50X's had more bass extension. that is about it. Midrange on the M50X's were quite good when compared to the Lamda Pro's & yes the M50X's are sold to studios & studios do in fact buy them.
Now are you going to denigrate those as well. Those are 10,000 dollar electrostatic headphones known for their excellent response & were also used in studios.