Hello ! first please forgive my english, i'm french, nobody 's perfect !
Just my actual experience :
I 'm really surprised of what I just read : I own a K-01 since 3 weeks (300 hours break-in), and I don't hear any noise (before deciding, I tried a dCS Puccini that WAS noisy). And his sound is much more subtile than my previous marantz SA7-s1.
Perhaps it depends on what it's linked with, in my case Jeff Rowland WITH (very important) PC-1 feeding and Tannoy Kingdom Royal speakers, connected by Synergistic research cables.
A friend of mine has got a K-03 and is like me astounished by its musical sound, but hears no disturbing noise.