New shoes, new pedals?

telemark
telemark Posts: 18
edited May 2009 in Road buying advice
Have just got in from trying out my new Mavic Avenir shoes after 12 months on floppy entry level Shimanos. I'm amazed and pleased at the performance hike of a properly stiff sole.

However I'm still using my original SPD pedals (M520 I think). Any views on whether I'm going to get a significant performance hike from moving to "proper" road pedals such as Look or Keo or the like?