Details matter when it comes to metallurgy. There's no testing of bronze vs iron (as opposed to steel) out there simply because you'd have to handmake your own crappy iron weapon for the test, and even then it matters how the iron is tempered, the exact alloy of the bronze, relative thicknesses, etc.
That goes for all the super cool youtube vids along these lines--arrows versus plate armor, swords versus mail, and so on. The exact gauge of the steel matters. The curvature of the steel matters. The mass and velocity of the arrow matter, as does the exact shape of the arrowhead. It matters whether the mail is 4-to-1 or 6-to-1 linked, whether it's butted or riveted or welded, whether the links are flat or wire. Can arrows kill a mounted knight in full armor? The answer is... it depends!