This maybe impossible to answer, I currently own a NEX 7 with 3 lenses, Sigma 19m, 30mm and Sony 50mm.
Yet I rented last week the Sigma DPM2, and was very impressed with IQ even with all the quirks and SPP.
I only shoot at base ISO, no lo light stuff.
I am also going to rent the XE-1 w/h 18mm, 35mm and 60mm when they become available in the USA.
I realize the DP2M is a total different animal, yet the IQ is quite amazing, though everything else pretty much sucks, no evf, terrible battery life, etc.
Fuji looks very interesting though.... So probably more to the point how would the XE-1 IQ compare to my NEX 7?