Agent can outfight T-1000, but not kill it unless they fight near something molten hot. If T happens to impale an agent, then the agent will take over someone else's body and continue fighting.
This fight, with no specified stipulations, can be a long stalemate unless gets melted. If killing an agent's host body once counts as a win, then T might have a chance to take a few wins....otherwise stalemate unless the agent can melt him.
the more I think about it the more I lean towards the Agent. The only know way to kill an Agent or even hurt one was when Neo flew into one or when Smith overwrote them, T1000 can be hurt by extreme cold and killed by extreme heat, he doesn't have the ability to kill an Agent while the Agent will eventually be able to kill T1000, plus Agents are much much better fighters and just as strong if not stronger than the T1000
T 1000 wins overall. Unless the agent has foreknowledge on the facts that extreme heat or acid will work on T 1000.
The argument of T 1000 not being fast is negated by the fact T 1000 can and has shown to catch fists in his liquid body. Add to the fact T 1000 is as strong as the agent negates any advantage the agent could have.
__________________ Too much work trying to figure how to size a Sig right to have one.