I have to comment on the fact that when it comes to the serum, Bucky is souped UP on that stuff. Steve probably tones back how much he’s hitting normal humans, but GOOD LANDS. Bucky’s not just knocking someone down, he’s getting them air borne. With a kick. We know the cyborg arm is really strong, but BUCKY is insanely strong. Reminds me of the comic where he throws an arrow through someone’s face with his good arm, not even the cyborg one. Bucky is scary ramped up in the strength department.
This is why when people talk about Bucky having received an “inferior” version of the serum, I kind of raise my eyebrows. The overall effects of Zola’s serum might have differed from Erskine’s, but it certainly doesn’t seem to have left Bucky physically weaker. There are a lot of fics that assume Bucky would not be a match for Steve if Steve were actually willing to fight him, but Bucky more than proves his strength in Winter Soldier.