I owned the K-01 a wonderful CD player, had massive attack and dynamics that put vinyl to shame. Loved it. Got ill so I sold the K-01, and the only player I considered was the Marantz SA-10S1. I’ve not looked back with regret. The K-01 still has more massive in the attack, but the Marantz reproduce the music with a flair, a class to it, does not throw things at you it just there to enjoy the performance. 20K vs. 7K in pricing no contest sound-wise, perhaps weight-wise 40 lbs. vs 80 lbs. both are a bit different but both oh so good. Depending on one’s system and gear you might prefer one over the other. I think in SACD discs the Marantz might edge the K-01. The K-01 power supply is much larger which is why it sounds more massive than it should for 20K. But the Marantz with that Mastering Engine design makes USB to CD sound so natural and real.