[kanaka]

I made a quick gist of the current LOC/file size stats: https://gist.github.com/kanaka/fdef20f5d0c2e04b97d9106b2f2f2...

Note that this should obviously be taken with a grain of salt: the implementations were created by many different people each with their own style and differing experience levels with the target language. That being said, from my own experience, I think the concision (size) of the implementation often reflects how "Lispy" a language is. Most of the Lisps are in the top half of the list (fewest LOCs). Ruby is often described as very Lisp-like. Factor is one that stands out for me (second after mal itself). Factor also happens to be one of the fastest implementations (for certain microbenchmarks).