Esoteric CDPs

Has anyone ever compared a K-07 to a K-01 or 3 or 5?  Can you describe what you heard?  I have a K-07, do I really need to upgrade?  The rest of my system is Coincident Frankensteins and Zu Soul Supremes.  Thank you.
Pick the heaviest, most bulky one.

You may think of me being sarcastic.  Trust me, when you want to get rid of it, whatever model you picked wouldn’t make any difference in your determination.