10. Nikon D610 - While the D600 was a decent camera, problems with quality control left consumers with a perception that the camera had issues. No matter how large or small the volume of cameras that really had an issue. Nikon finally dealt with the dust/oil problem of the D600, and that meant a line had to be drawn. Thus a "new" camera came into being with slightly changed specs.
9. Olympus E-P5 - Olympus updated their compact high end camera body. The PEN series of cameras were the first truly interesting micro 4/3s bodies on the market, taking a classic style and putting it into a modern package. The E-P5 continuous this line, and modernized it with a current generation sensor and auto focus.
6. Fuji X-M1 - Up to this point Fuji cameras with an X-Trans Sensor have only appeared in camera in the upper end of the consumer market. With the arrival of the, somewhat feature stripped, X-M1 the senor has became available to the mid-range and entry level market.
5. Pentax K-3 - A significant upgrade over the K5II, in terms of speed and auto focus. No longer are there two high end cameras in the Pentax lineup (split as the K-5II and K-5IIs in the last generation). The K-3 was also the only prosumer APS-C DSLR released in 2013.
4. Ricoh GR - The first truly pocketable APS-C sensor camera (fixed lens) on the market. While other compact APS-C cameras have come into the market, Fuji X-100s and Nikon Coolpix A, neither of those cameras would be considered truly pocketable. The Ricoh GR has a very photographer friendly design, while remaining small.