When I first got my guitar (Yamaha FD01S) I was trying to buy a gig bag for it, but it was too big for most of the bags they had at Guitar Center. Even the guy helping me out said that Yamahas were a bit bigger. I've never played another acoustic or compared one side by side with mine, but I just assumed that Yamahas were slightly bigger because of this.
I tried out a Yamaha FG750 a few days ago and yea I thought the body was a lot more larger than most other dreadnoughts.
Ibanez RG760 (For Sale)
Yamaha Pacifica (For Sale)
Zoom G2.1U effects pedal (For Sale)
Tanglewood Acoustic
Kustom 16DFX Amp
Compared em today and definitely larger than say a martin or taylor but exactly the same size as a breedlove...so breedlove's are a little larger as well.

thanks everyone!