There was no mention in the article of the LispWorks editor, that was derived from Hemlock. A really nice editor to use when I need the features of the LispWorks IDE, otherwise my favorite is just Emacs configured for LispWorks and SBCL.
For the discussion topic: I am not sure if the LispWorks editor is faster, snappier, etc. than Emacs because it is compiled Common Lisp.