Although this isn't a question I have been dying to know the answer to, as a marketer I did find the video to be quite interesting.
Below is a video of Hope Bagozzi, Director of Marketing for McDonalds Canada, discussing the behind the scenes of a McDonalds photo shoot.
Bagozzi purchases a regular Quarter Pounder with Cheese, and brings it to the photo studio for a direct comparison. Enjoy! And as always, please do leave a comment.