I think I know
His cheekbones are positioned diagonally so when viewed from a 45 degree angle it appears high but head on you only get the lower portion of it which would only be evident if he turns his face to a 45 degree angle. Nevertheless a diagram would really help to reveal the truth behind his zygomatic structure and zygomatic structures like his

So I think Guy Pearce is the 3.5:4, Zhao Lei is 19:20, and Tom Harding is 9:8. But the thing is they all have the same height cheekbones with about the same prominence. The illusion of different heights is due to the amount of prognathism. Since Tom Harding has the least prognathism it is going to appear as though he has the lowest cheekbones.

Tom Hardy is smiling and you can see that kind of Mongolian cheek thing going on though his aren't readily apparent.  If he had shed about 10 pounds or so he would probaby start looking it even more.

3.5:4 is like Guy Pearce. Because the alignment of the cheekbones relative to the rest of the lower jaw is more "retracted" the bottom portion of the cheekbones is not protrusive. So his cheekbones are "high" in that regard. 9:8 is like Tom Hardy. The cheekbones don't have the "retraction" and his cheeks will appear rounded in the frontal plane, or protrusive. Therefore the lower portion are more visible and we say he has medium cheekbone height. Zhao Lei probably has some really prominent cheekbones and they are also high but the thing is he has just a bit of prognathism so the protrusive bit doesn't show as much. People with really vertically expansive or wide bottom jawlines can also be equated in a way to the 3.5:4 example because the configuration will add a layer of concealment to the lower portion of the cheekbones making them appear more "retracted".

"Aryan perfection" has a 19:20 minor prognathism with advanced vertical jaw height. The prominence of the lower portion of his cheekbones is hidden and therefore his cheekbones appear higher than even those of Zhao Lei.