The D7100 to D7200, I do not know if it was worth it, but in my case, the D7000 to D7200, there is no comparison. 2 Stops, and I make a very good response. A similar sensitivity, a significant gain in background noise. An idea? In 6400 the D7000 was a bit limited, ISO 12000, the D7200 is very significant. Amazing all the same, as I never changes optical (24/450 mm), the day of the reception I found a nice crap on my images! One star less? Due to its Nikon ergonomics.