Ok, this is not as easy as I thought. Like many here, I have a little stash (K240S, K501, SR-404, MDR-7506). At some point, I had some of those exotic AT woodies. However, the K501 invariably were the ones been connected to the Headmaster. The only serious contenders were the SR-404. So to make a long story short, the K501 were doing it for me.
When the K701 were announced, it sort of look like another FOM. But in time, curiosity got the better part of me and I bought a pair. Out of the box, I was disappointed. But in time they got better. There is nothing wrong with them, they are great cans and it is easy to see why so many like them.
But guess what is still connected to the Headmaster: K501.
I will let the K701 burn a bit more. I am guessing they have about 150 hours now. If I recall, the K501 took a very long time.