taking into consideration that he is like 6'6 ? Id say that his physique is impressive either way.
I do think that JF is natural though, I mean if he can be that big at 6'6 who is to say he needed steroids ? ovbiously looking at other things, like how he stores his fat, the "x" frame and generally symmetrical features + handsome face, I would say he has really good genetics + great natural hormones.
Maybe he did a cycle of halodrol or something, but I doubt it