No, the moment arms and leverage is better in the great apes and chimpanzees, but the muscles, the chemical engine, is basically equally efficient. There is only so much energy that can be provided by that chemical engine. . . and the theoretical maximum land animal size that could live under one standard gravity—that is move, eat, mate—is approximately 14,000 kilos or about 31,000 pounds. But that is under ideal conditions. Practical is probably more like 20,000 lbs.
Paraceratherium was apparently 18 tons. Related to rhinos. But dead now, kind of like the RINOs.
Interesting!
What about ants, insects etc., who are so powerful for their size, how do they achieve their great comparable strength?
Ed