I bought an inexpensive Nikon adapter from Amazon (Fotodiox - around 20USD). The fit isn't perfect - there is a tiny bit of play when the lens is mounted, but it doesn't appear to affect the image.
I also have the 85mm lens you mention in Sony A mount because I used to have an Alpha. I bought the same inexpesnive m43 adapter for it and the fit is perfect. It seems to be hit and miss with the cheap brands.
Most of the expensive adapters (multi-hundreds USD) seem to have good reviews, but I have no experience there. For my purposes, the cheap ones do what is needed.
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