600d vs 650d high ISO noise
Using the DPR stdio scene comparison tool, the 650D seems to be a little noisier at high ISO of 6400. Less noticeable on colors but clearly apparent on blacks.
Am wondering why this would be so since they are both apparently using the same sensor. Could you attribute this to variance in the production process of the sensors, or perhaps the signal from the sensors are amplified a bit more to compensate for the additional phase detect layer?