This old, but you might be able to rerun it. http://per.bothner.com/blog/2010/Kawa-in-shootout/ Back in 2010 Kawa looks to be beating Clojure pretty handily. Not sure how well Kawa fares under robovm. All worth a weekend hack for those with some time.
Does anyone know?
I am still hoping that Clojure 1.7 will finally be fast enough.