Habt Ihr übrigens mal das Testbild angeschaut? Da rauscht es in den dunklen Bereich aber mächtig. Und es ist nur ISO100.
Kleiner Sensor - hohe Packungsdichte
Man braucht ja nur bei Canon selbst nachzulesen....

"Image quality in digital SLRs is determined not only by pixel count but also by sensor size. Given two cameras with the same number of pixels, the one with the larger CMOS sensor usually delivers finer gradation resulting from higher sensitivity, wider dynamic range, and better S/N ratio. It also has a wider depth of field allowing shallower settings for effective background blurs.
A large CMOS sensor offers better image quality than a smaller because the larger may contain bigger-sized pixels (...).
Bigger pixels offer higher sensitivity
Large-capacity pixels for wider dynamic range
Better S/N ratio from large-capacity pixels
Given two differently sized pixels handling the same amount of noise, there will be less noise impact on the resulting image of the larger pixel. Since larger-sized pixels catch more light, the signal carries more data than noise within the overall image information. This results in a better signal-to-noise ratio, which is particularly effective for fine gradation in low-light shots.
Note: S/N ratio is a measure indicating optical signal purity. The higher the S/N ratio, the smaller the amount of noise and, therefore, the signal may be described as one of high definition."
Dieser Text ist allerdings schon ein paar Tage älter. Vielleicht wird er ja demnächst im Zusammenhang mit der neuen 1DS3 revidiert
