>>> How does our ksh do?
>>>> ksh NetBSD 2.0_STABLE:   # tests 6856 passed 2584 failed 4272

>Incidently, at this point, what's left in ksh that isn't in /bin/sh?

In 2.0 anyway, emacs mode bindings for [pd]ksh's 

\e\e	complete word
\e=	list possible completions
\e.	yank last word from previous line

there are probably more, but those are the ones that frustrate me the most.
Does our sh do ksh style arrays?  I find that invaluable for cd history.
eg.

: sjg:226; cd -l
 22 /var/db/pkg
 21 /NetBSD/current/src
<snip/>
  3 /homes/sjg/py/src/tools
  2 /g/sjg/work/sjg/mk
  1 /g/sjg/work/sjg/bin/bmake
  0 /homes/sjg
: sjg:227; 

cd -2 or cd -mk would take me to /g/sjg/work/sjg/mk

--sjg