The Nikon D7200 improves over its predecessor in one important way, offering a greatly improved buffer. Other improvements are more subtle, but more sensitive AF and an improved video specification make the D7200 a more capable camera than the model which came before it. We've had a D7200 for a few days, and wasted no time pairing it with Sigma's excellent 18-35mm F1.8 A to get some real-world samples.