"For the moment, I will address this with the following observation: at Pivotal we have many developers who know Ruby and Java and the same developers are several times more productive in Ruby. In this comparison, my money is more on Ruby compared to Python than Rails compared to Django; I can't see how we can be as productive with Python as we are with Ruby."

So they know Java and Ruby, and thus Ruby is more productive than Python?

It makes no sense.