If I remember the comics, Captain America is merely the peak of human abilities, both physical and menta, rather than superhuman. Yet in the MCU it seems to be that that he often (though not always) is actually Super human, the Cap serum Blonsky got, made him so, even before the Abomination crap.
Rewatching Civil War, there is the absolute ass kicking Cap gave Tony Stark at the end, despite Tony being in his suit. Its clear he would have killed* him if he had not stopped, early on in First Avenger, OTH, Cap had to notably strain to get a guardrail to bend and in Winter Soldier the unpowered Frenchie actually gets some good hits on him.
Obviously, he is an exeprienced combat veteran, and Tony is not, but Tony’s suit has shrugged off direct hits from Tank shells, yet cannot withstand the sustained punishment. Tony is clearly affected, in Homecoming he tells Peter that Captain was playing with him and he would have killed him if he wanted to.
What do you think?
*Though must be pointed out, with the exception of his time in Europe in WW2 and againts the aliens in Avengers, every time we see Rogers fighting, he is aiming to capture or escape, not kill, and this is probably the only other time he is.