The only way to answer that question is to have the same driver drive all 3 cars at a track on the same day, otherwise you're wasting your time. A different driver makes all the difference in the world.
My last track day, I passed numerous M3's, but ran into a 350Z in my 3rd session that I just could not catch. My lap times were slower that session, maybe because I had a passenger. I also don't know if the Z had any mods.
http://media.putfile.com/Laguna-Seca-Session-2