IMO unless victor martinez/kai greene come in super conditioned there's no one at this moment that can match this gentic freak.
Victor is the only one that comes to mind that can match him at his 'game' but tbh I doubt he could if he 'struggles' to place higher than dennis, branch and evan.
Kai is the only one that has enough size to overpower him but mehh he never replicates his arnold classic conditioning so he will always looks 'soft' next to him.
Beyeke could match him in a couple years though, like phil got some nice muscle bellies in the upper body and he sure has got better quads development (not talking of size). Phil Heath upper body and Kai Greene quads are one dirty combo.