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Don't forget where you are working in the EV range. While the D7100 works in a range of -2 to 19 EV, it might only have a dynamic range of 10 to 12 stops. The sensor is going to exhibit different noise levels at higher ISO settings when photographing scenes in the upper EV range versus the lower EV range.
Moist of the time we use higher ISO settings when we are working in the lower EV range of available light. So, when comparing high ISO performance of two cameras, it doesn't make sense to take photographs in a the higher...Show more →
The captured EV range is a function of exposure rather than ambient lighting level. There is no difference in IQ between high LV lighting vs low LV lighting if the absolute exposure is the same. Again, lighting density is intensity x time, meaning intensity and time are interchangeable, short of any minor differences in non-uniform noise from very long exposures (ie, digital reciprocity failure).