Note that the array-expressions previously in numbapro only have been moved to numba (our plan for all premium products is to move features into open source as we get funds to support that).
But, the upshot is that Numba produces code that is either faster or roughly the same speed as C or Cython.
It's not common to see C/Fortran comparisons because they can be a pain to write. I'm implementing a serial C version for next week's blog post, though.