I don't know about your Harmony Sovereign, but I have one from 1963 that is an amazing guitar. True, the neck is somewhat wide but not nearly as clubby as old Kays I've seen. I have had this guitar worked on by a fine luthier who did a neck reset and modified the bridge & saddle which has improved the action. I use it primarily for bluegrass anyway so who cares about playing up the neck. The tone is loud, full, and rich with medium guage bronze phospors. I will honestly compare it to most any Martin.

You are obviously unaware that the Harmony Sovereign is considered the best low end "cheap" guitar ever made. If you buy Vintage Guitar magazine and go to vintage guitar shows like I do, you know that Sovereigns of this vintage in decent shape can command $500-600. A pretty good price for something that sold for $80 new.