Originally posted by Winder a big jump forward in high ISO
Can't see that happening, as it it determined by the sensor's QE, fill-factor, AA filter & Bayer CFA transmittance/selectivity. The K-5/D7000 has about 46%-48% QE. Max. seems to be about 60% with current technology according to sensorgen.info. The domain expired, but here's an archived version:
Sensorgen - digital camera sensor data
I think the Nikon P330's QE of 75% could be a measurement funny, unless it has wonder filters in its CFA that no one else uses.
At second glace, The P330 has a BSI sensor. It would be hard to implement BSI in an APS-C sized sensor.
Dan.