Nex 7 versus Xpro 1 and Olympus OMD

I am looking at getting a mirrorless camera. I already have a Nikon D800E and lenses and want something more compact yet super high image quality.

Nex 7 currently tops DPreview marks in this category.

How are users of this camera finding its performance? Does it have image quality on par with these other cameras?

Would you recommend it over these other choices? Are there other equivalent choices I am missing?

Greg.