Noise and JPEG processing, higher ISO sensitivities
While ISO 3200 isn't clean, it's pretty good, and depending upon scene content you can even go as high as ISO 6400. There's a huge dropoff in quality in the upper expanded range, however, and because you can't shoot raw in that range I don't really suggest using ISO 12800 or 25600.
Overall, the camera does an excellent job of retaining detail in blown-out highlights, far better than most of its similarly priced competitors. The same goes for clipped shadows, which you can bring up without introducing any noise.
Normally, this shot would have made a complete mush of the background grating. There's some color noise, especially on the tire spokes, but the shot is still quite usable, and the JPEG processing stands up very well.
(1/60 sec, f2.8, spot metering, AWB, ISO 6400, 27mm lens)