K701s do sound similar to CK10s so I can understand where you are coming from. String on K701s too sound somewhat plasticly and lifeless, but if you're strictly talking about vocals, CK10s do a really good job at creating an intimate environment where vocals don't sound congested nor distant. When I listened to Diana Krall last night, I was really impressed at how clear and intimate it was. So, yes, I do agree that the vocals are quite wonderful on CK10s, maybe more so than PFEs and ER-4Ss. What I'm really impressed on CK10s are the sheer details and soundstage and how it creates air around all the instruments. Up until now, I didn't realize how detailed Rage against the machine can be but, now, I can hear the echo of the kick drums, plucking of the bass guitar and undistorted cymbals so nice and clear.