Cool, so you were experimenting with EQ on all of them, that does make it more interesting. You've taken the same approach as me then, using Harman EQ's on different headphones and then trying to compare them, whilst fine-tuning the individual Harman EQ's for each headphone (maybe increasing/decreasing the bass a little or EQ'ing down a few troublesome frequencies after listening). Well, that's exactly what I do, and yes we still come up with a favourite headphone even after trying to optimise each one using measurements & listening experience. I reckon some of what determines our favourite headphone is luck - stumbling upon a perfect EQ when combined with whatever unit to unit variation may exist, along with some unknowns like how well the headphone couples with your own anatomy (eg seal). I mean I have 4 units of K702 headphone for God's sake and I even have a favourite unit amoungst those even though I can measure each one on my miniDSP rig and do a perfect channel matching EQ for each one, as well as doing a compensatory Harman EQ for each of the different measured units of K702 I have - I still end up with a favourite unit out of those 4! Whatever you are doing & whatever I'm doing we're both trying to get to our best sound, and I believe you in your experiences. Your experiences can change over time, but if you keep coming back to the same headphone after repeated different experimentations & EQ's over a period of months for example then I'd say you're on your best sound.