Cap = Superman.
Iron Man = Batman.
The Iron Man/Batman comparisons have been done to death. Now Superman is the perfect human, he has more humanity than anyone on Earth, a set of deep set morals and a farm boy charm. The irony play is that Superman is not human. That is part of the evolution of the mystique where he is more human than human. Cap is all of those things without the super powers.
Here is the thing, Kal-El doesn't have powers except when near Earth's yellow sun. Without it, he is still all of those things with no power. Steve Rogers is all of those things except without the Super Soldier Serum he had no power. Even Clark Kent who used to be portrayed as a puny bumbling human was what Steve was before the serum enhances him. At their root and before Sentry was added in, Captain America was Marvel's Superman. Remember back in the 1960s Lee and company wanted a more humanic group of superheroes, more real than DC which is why we have heroes with issues. Captain America is a Superman created by humanity's science and bringing him from the Golden Age into the Silver Age amongst their new heroes made him a man out of time, a man with an embedded set of problems.
I can't wait for the Avengers HT figures.