Sony's bringing its flagship APS-C mirrorless camera in-line with its full-frame counterpart with the Alpha 6600. Its 24.2-megapixel Exmor CMOS image sensor is paired with the latest Bionz X image processor to enable a Fast Hybrid AF system that locks focus in just 0.02 seconds and can track both subjects and their eyes in real-time. 5-axis in-body image stabilization keeps things sharp even in low light, and 4K movie recording with full-pixel readout without pixel binning in Super 35mm format gives equal attention to video. Rounding out the improvement list is a Sony Z battery good for up to 810 captures per charge, a headphone jack for monitor audio during filming, and better color reproduction. It will be available in a body-only package or in a kit paired with an 18-135mm lens for $400 more.