No, from closed back i tried demon d5200 and today i will try shure 1540. I listened also to hd660s, hd650, sundara open and i must say that d5200=hd650<hd660s<sundara open<<k371. Because sundara open was great but hasn't blow my mind, I didnt tried closed back version. I will reply to you in the weekend about impressions on shure If you want to. If you get your hands on 700 Pro X then tell me what you think about them, i am also curious

Rights now i am testing various closed and open backs. I tested 6 so far. I had the unpleasure to listen to K371 and had the same impressions. I used it with ifi hip dac 2 and after 10 minutes i decided to return them asap. Maybe i got a bad pair but i will not give them a second try.