Ryu.
Sagat's taken a burst of rifle fire to the chest, only to flex his muscles and pop the bullets out. Balrog practices on punching bags full of cinderblocks and has one-punched an Elephant. Charlie has dropped a cliff face on M. Bison with a flash kick. Chun Li has kicked Cammy 3 stories into the air with one hit. Ryu himself has walked around with a multi-ton boulder on his back, while his ki was being drained by Oro (who was riding the boulder), then got into a fight immediately after where he dragonpunched Hugo though a building.
Captain America is impressive physically, but not up to Street Fighter standards.
From canon sources? (Which is basically the Street Fighter games, and nothing else). Destroying an island.
Not sure what he's done in various animes, but in the Asura's Wrath dlc, he was going toe to toe with Asura, who's more or less on Bayonetta's level. Planet/cosmic level type.
In the demo alone, Asura's stopping a giant finger that covers several continents..