I own many Emerson's, and love them all. I own one Kershaw Emerson, and while it's a nice knife for the price, it's kind of meh, compared to my Emersons. I owned a 0620cf for a while, and it was a very nice knife, but I ended up trading it for an Emerson Specwar with hard chrome coated blade.
I also think that the 0620cf has nothing over my Iron Dragon, which is, IMO, one of the best TI frame lock knives I've ever owned. I also think that my Sheepdog is one of the best flippers I've ever owned.
Both knives have no fit and finish issues. As a matter of fact, I have no issues with the fit and finish on any of my Emersons. I've seen far too many posts from people complaining about stiffness, grittiness, and lock stick right out of the box, and dumping the knife without ever letting it break in. This is lack of experience/knowledge about the product and its design IMO, and not a fit and finish issue.
I also believe that the EKI knives have more "soul" that the ZT's.