The D750 is a great DSLR camera. Its AF system is fast and effective, its Matrix metering system is very capable delivering correct exposure in a wide range of situations and it produces images that have natural, yet vibrant colours.
Although it cannot offer the class-leading detail resolution of the D810, the D750 is more than a match for the D610 in this respect. It captures an impressive level of sharp detail and noise is controlled well – though not always as well as its main rivals.
It's also good to see the introduction of a tilting screen on a full-frame camera – it's a shame it's not fully articulating, but it's a move in the right direction and on a weatherproof system.
It has the majority of the features that an enthusiast would want, along with a few modern niceties like Wi-Fi connectivity. There are a few inclusions that seem more aimed at less experienced photographers that could perhaps have been better thought out for the enthusiast, but all the essentials that an enthusiast want are there and based upon proven systems.
Actually costing more than its full-frame stablemate, the D500 is Nikon's flagship APS-C DX-format DSLR. With a 20.9MP sensor that has an ISO limit of 1,640,000 and can shoot 200 raw files at 10fps, the D500 is a real speed machine. That's not forgetting the class-leading 153-point AF system. A stunning camera, but not for everyone.
Read the full review: Nikon D500
The D750 is good value, but the D610 gets you full-frame for even less. It's only an incremental upgrade over the preceding D600, but it addresses that camera's issues and boasts top-notch image and build quality. The 39-point AF system is reliable and the 6fps continuous shooting speed respectable. Overshadowed by the newer D750, but it's still an excellent camera.
Read the full review: Nikon D610
Sony Alpha A7 II
With a 24MP full-frame sensor, this compact mirrorless camera is a match for the D750 here. This second-generation model benefits from a number of improvements, including 5-axis image stabilisation, an all-magnesium body and a wide selection of supported video formats. That said, lens choice, though improving, is still limited compared to both Canon and Nikon.
Read the full review: Sony Alpha A7 II