Yates was more impressive. Harder, more vascular and more shocking. Matarazzo's had a baloon look to them.
Here Mike is in the background admiring Yates' calves.
Dillet had good calves but Dorian has him beat as well. I think Dorian's were the most impressive ever when everything is considered: mass, vascularity, hardness, graininess. They were just plain nasty!

Look how deep those lines are from the side!

Mike's were not as impressive, especially from the front:

