Not a fan of Phil but you can't deny the incredible amount of muscle he's packed on his relatively petite frame. He's lambasted for his lack of clavicle width but the amount of meat he's packed on his delts nullifies this. One of his most impressive feature is his forearms. I don't think anyone has achieved this level of development. It just looks like someone pieced in this big hunk of meat.
Of course forearms, unless severely undeveloped (which I have never seen in an advance bodybuilder), is not considered a deal breaker. But it is impressive nonetheless especially in comparison shots.
Kai Greene is one of the most massively muscular bodybuilders that has ever lived. But look at how skinny his arms look, especially his forearms, compared to Heath.