PL 25mm/1.4 with EC-14 question

If I add a Zuiko EC-14 converter to my Panaleica 25mm/1.4 lens, what will be the resulting f stop loss? The literature says that I will lose "one stop" so does that make the new combination a 2.0 / 35mm ?

I am trying to make my 25mm into a perfect portarit lens.

Thanks
Marshall
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E1/grip, E500, Zuiko 7-14, 40-150, 70-300, 50/F2.Panaleica 14-150, 25/1.4