Here's a list of bodybuilders for comparison. Height + weight, taken from here: https://jackedgorilla.com/biggest-bodybuilders/ (I dunno how trustworthy it is, only gives vague sources, but we need only an idea), converted to cm and kg (rounded down)
Dennis Wolf: 180 cm, 117 kg
Dennis James: 172 cm, 117 kg
Jay Cutler: 177 cm, 117 kg
Dorian Yates: 177 cm, 117 kg (wtf, all the same)
Roelly Winklaar: 172 cm, 120 kg
Jean-Pierre Fux: 180 cm, 124 kg
Nasser El Sonbaty: 180 cm, 126 kg
Zack Kahn: 182 cm, 127 kg
Markus Rühl: 177 cm, 129 kg
Paul Dillet: 185 cm, 129 kg
Lou Ferrigno: 193 cm, 129 kg
Günter Schlierkamp: 185 cm, 134 kg
Ronnie Coleman: 180 cm, 136 kg
Big Ramy: 177 cm, 143 kg
Greg Kovacs: 193 cm, 149 kg
Now I'm thinking how much this tells us. Only the last four falls into the average box of the Makuuchi division by weight. It sure they have the bulk of their muscles on their upper body: back, chest, shoulders, neck, arms... while rikishis build most of their muscles on their legs, ass, lower back and stomach - as they have to move weight in different fashion. I noted above that for most their arms look relatively thin. Only a few tries and succeed to lift his opponent up and bring them out (Terunofuji can do that with some opponents).