OMD is the best yet for m4/3.
Small, good lenses, small overall system.
Sensor performance trade-off still there, but I think its good enough and ppl who buy into a m4/3 camera should already have decided on this conscientious choice.
Those who know not of the sensor trade-offs and bought based on looks, probably don't need to know about the trade-offs anyway
NEX7, nice system on specs (ie. paper). Too expensive to me as a body with not much small/good lenses at good prices. Still usable though with 16/2.8; 25/1.8 and 50/1.8. Throw in a good MF lens or two to cover the gaps (eg. M mount Voigtlander 12/5.6; 75/1.8) and its still viable.
Just not as worth the money imo, to pay quite a bit for a high end body with all the bells and whistles, but then need to work around the lens limitations.
Esp. so when the 5n does about the same thing for less.
Xpro1; Seems like good IQ and ISO performance. AF and MF aids needs to improve though. Pricey as well for what it is (APS-C, slow AF). Liveable AF speed imo, though a bit hard to swallow given the price of the camera. I can see it doing very well in the hands of a photographer willing to live/work around its usability quirks.
Steve Huff reviews have a bottom line. He keeps the cameras he really likes
He does have NEX7 and is keeping the OMD and returning the pre-ordered Xpro1s