I have a pair of Grado SR80x, Sennheiser HD560S and Hifiman HE400SE. The measurements tell me I should prefer the Sennheiser and Hifiman.... but I keep going back to the Grado's. I guess it's the treble boost, as they sound way more open than the other two. There also quite refreshing as they're the polar opposite of that muddy mid-bass sound that I get from most bluetooth headphones I've tried.