بله قطعا بهتره ولی خوب باید ببینید فلش براتون کاربرد داره ؟ ممکنه بخرید و بعد ببینید صرفا داره خاک میخوره .
در مورد فوکوس هم نقل قول از digitalcameraworld :
Nikon D7200 vs D7100: autofocus
Another improvement comes in the form of the autofocusing system on board the D7200. It has inherited the Multi-Cam 3500 II from cameras higher up in the range, such as the full-frame D810 which should make it more accurate and responsive. It has a 51 point autofocus.
If you use the crop mode to shoot, those points will cover the entire frame, but otherwise they are centred around the middle. 15 of those points are the more sensitive cross type, while the central point is sensitive to f/8, making it useful for use with lens converters.
Meanwhile, the D7100 uses the Multi-CAM 3500 DX autofocusing system, but it still has 51 points, with 15 cross type and one f/8 sensitive.