To add to this, don't we want to look at:

a) How many people in the company knows java vs. perl

b) Do they have any reusable libraries in one language

c) What kind of IDEs they use and what language it supports

d) what about other supporting tools?

e) what about documents such as design/coding guidelines?

Don't you have to consider all these if you want to introduce a new language to a company?