my entire left side is larger than my right. it is something I have started to become accustomed to but is still frustrating. It's odd however that the left is not really stronger than the right. They are about equal. I took measurements and progress pics not too long ago, and my left arm is 5/8" larger than my right, my left leg is an entire inch larger than my right with more development of my hamstring, and my left pec sits about a 1/2" higher than my right from the side. The top left section of my abdominals is the same way too... go figure. Since it doesn't seem to negitively impact my strength, I kind of just ignore it. However, you know when you photographer comments on it, it is an obvious issue.
Zach