I'm finished vs. I have finished

Is there a difference between these two sentences and are they both grammatically correct?

'Wait until I am finished washing the dishes' vs. 'Wait until I have finished washing the dishes'


Grammatically, both are correct, but they are linguistically different. The first sentence does, in fact describe the speaker as in the state or condition of being finished, specifically with the task of washing the dishes. This construction is the more passive of the two. The second version describes more accurately the completion of the task as the point of reference for the listener. To put it another way, the first sentence commands the listener to wait until the speaker is in the condition of being finished, the sencond says to wait until the action is completed.
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