I agree with jc21 , In terms of size you definately out-mass him , but size is not the most important thing on stage : It's the total package that matters the most.
Unless you can make big improvements in your conditioning Brett looks like leaner guy. In terms of shape again Brett has a "cleaner" looking physique with nicer lines. However , you definately have much better legs and your muscle are dense.
Dorian Yates was the thickest guy on stage however he would have lost every show if he wasn't ripped and dry.
So in summary: If your conditioning is EQUAL to Brett's it would basically come down to favouring shape vs. size , which can go either way.
With that being said if your even a little off your conditioning Brett will have no problem. He may be smaller then you but on stage being leaner makes you twice as big.