I was thinking that the other day when I reviewed it as well. Cell's neck moves, but his tank is more solid and it's a fucking kick. Semi Cell's tank is impressive, but he does move a lot more than you'd think, he shakes quite a bit. In the anime, it felt like it was hitting rock, but his body does vibrate a bit.
Cell vs Vegeta is right there with it, if not superior. Those gaps can be debated more intensely imo.