I'm gonna do my usual thing and link 2 articles you should read. While these articles don't answer your question directly, your question should be answered by reading between the lines.
First article is from the Cosmic Variance blog (written by a faculty member at CalTech):http://blogs.discovermagazine.com/cosmi ... te-school/
Read the part about the personal essay and the part about theory versus experiment.
The second article is written by a student who asked (very keen) questions to faculty members:http://pages.physics.cornell.edu/~larri ... chool.html
Particularly read the part about the personal statement.
TL,DR version: no, it doesn't matter (just like everyone else in this thread told you).