I'm definitely interested in your results. I do want to chime in to say that I do not think this would, in any way, take away from any of these efforts. If anything, I would hope they would all help challenge each other. In a beneficial way.
I finally got around to doing this, and the results were nearly the same on the Mandelbrot benchmark.
SBCL generates slightly faster code, but in this case it's using less efficient multi-threading.
