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Added on December 19, 2011, 10:34 pm
Currently Sony NEX-5n seems to deliver the best dynamic range which is a key to landscape. But I'm also curious in how the coming GX-1 can perform.

However, the advantage of having a Oly or Pana is that their lenses are interchangeable. You are able to mount a Lumix Leica on a PEN or a M.Zuiko Lens on GX series. I'm always amazed by the built quality of the new Zuiko lens which is fully metal. Anyway, if you are using a NEX-5n, you can also easily mount any of the Pana/Lumix lenses with a cheap adapter. Which I think is the best combo.

I guess Oly and Pana will give you nearly the same image quality as their sensor size are the same. If for compactness, Sony NEX-5n  or Olympus E-PL3 should suit you best, otherwise Pana GF3 is not very bulky as well.

But for performance, I believe Oly will offer you faster AF focus. I've seen an experienced street photographer capturing the expressions of the people by using his Olympu Pen.