It would be interesting to also measure peak RAM requirement.
Thank you for starting this work, for this kind of benchmarks is so much more interesting than the usual microbenchmarks. I hope others will rush in to offer implementations in other languages as well as optimisations for the existing implementations. I know I would if I had time.
These two goals are meaningful to me in the comparisons:
Consistency across langauges
Idiomatic use of language features
A non-trivial application like this is a great way to see how languages differ.