As some wise person once said, "we just don't know until we know". Even 'confirmation of what we expect' is important new information.Secondly, what a shocker it would be to find that Mars has a similar element distribution in the soil samples? Let's see. It aggregated into its current form most likely in its next out from the earth slot from the sun. Would there be a reason to suppose that it would be dramatically different is all I can wonder?
Not for microbes. I think "mere" bacteria would send exobiologists into raptures of delight.But the current Martian extremes of temperature and lack of atmosphere would surely be extinction events here on earth even if all other things were equal.