This is one of the first batch of photos I took with the J1. It's handheld at ISO 800 with the 10-30mm kit lens. My opinion? It looks excellent - especially when you consider the smaller CX format sensor. Nikon has done a great job of controlling noise with the small sensor.
So far I've only shot JPEGs and haven't gone any higher than ISO 800. But all thing considered, this photo is a very nice start and has me feeling good about the camera.
The second photo here was shot at the same time, also at ISO 800. It's got a lot more detail to look at so it's a good sample to compare to the rose image. And again, I'm impressed with the image quality.