The gift of GX1

A friend gave me her GX1 and LVF2, no lenses. I am debating whether to sell it or to keep it, since I have to invest in a lens or two.

I mostly do portraits (family and friends) and landscape/architecture and shoot with the big cameras.

I am not a huge fan of MFT, but am willing to give it a second try since the wife has convinced me that I might be better off with a small travel camera.

Any ideas what would be a reasonable prime lens or telephoto?