It isn't wildly broader, now that I really compare. But it has a bit more...erm bulk, per se behind it, per se. @Mr.E can probably also vouch that it is a bit different, he uses them too. The left is my spare WB I ordered after being pleased with the first, and the right is a typical ZC 3.0.
I was actually surprised how hard it was to capture that the WB is ever so bigger. At one point, I think the WB had to have been a TT19 KO, but there are differences in the musculature sculpt. Subtle, but it is different. It also features painted and sculpted legs all the way down - and the heft, my goodness the figure is solid. It also features slightly smaller hands than HT uses, which look more in scale. Compared to the TT19 and it's KOs, it has a wider abdomen, which fills out the tanks a bit better. It's comparable to their AT-007 model, I believe, but you've gotta hunt a bit for WB bodies - they seem to be produced in very small volumes. I got mine parted out from Toy Anxiety from the World Box Kung Lao.
What is interesting is that everything from waist down is the same as the broad shoulder. So be aware that the jeans from the MC set are a bit big for either. A small padded loop around the hips would probably help. I believe the broad shoulder even uses the same arms as this.
Lastly, I attached a picture of the shirt before shrinking, and how the jacket fits over it. I think I might have put this on here before, but nevertheless it is relevant here.
