Rome wasn't known for their cavalry nor archery. They pretty much suck at it. Mercenaries would be no match for the Japanese.
If we're talking about the Eastern Roman Empire, they're more a contemporary as they fell 200 years before the Sengoku Jidai. The Western Roman Empire army that we're being asked to compare is over 1500 years older. I think some people are assuming that there are 0 significant advances in metallurgy during all those years.
I don't think the Roman gladius can even compare to a modern steak knife.
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