Should a Python programmer be paid higher than a PHP / Perl / Java programmer ?

This question might sound stupid, but I have been wondering about this. Say I hire two developers with similar experience and expertise in my company. One is for a Python project and another one is for Java project. Should they get same compensation? A couple of years back, when I heard about Python from one of my senior friend (who is a CTO of a software firm, a very experienced guy), he told me that he likes Python because, development speed is lot faster in this language. He, from his experience believes that if a project takes six months to be completed using Java, four months should be good enough if it's done using Python. He was also planning for a project where he choose Python, and his logic was, he will use four Python developers for the project and if he choose Java instead of Python, it would take 10 developers to complete the project (same time frame). Then I said to him, "so, are you going to pay higher to the Python devs?" ... he just smiled :) ...

So folks, what do you think? Should the Python devs get more? Share your thoughts.