Magic Find

[ShadowHM]

Your magic find works when you, or your merc kills an enemy.
When your mercenary kills an enemy he gets your MF + his own MF
I am pretty sure that your own MF doesn't affect your party member's MF
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AFAIK, that summarizes it accurately. The player (or merc of that player) who gets the killing blow is the one whose MF is counted.

And the gear equipped when the killing blow is landed is what counts. If you have a higher MF weapon or shield on weapon swap, but do not have it up at the time of the killing blow, it is not counted.