The Sony a9 is a big step forward for mirrorless technology. It betters the fastest, most expensive SLRs in capture rate, spreads its autofocus system across almost the entirety of a full-fame image sensor, and has a really fantastic EVF-one that, in many ways, is a better option for shooting action...
Shoots at 20fps with subject tracking; Full-frame 24MP image sensor; 93-percent focus coverage; Electronic shutter eliminates blackout; Also supports traditional mechanical shutter; Large, crisp EVF; Tilting touch LCD; In-body 5-axis stabilization; New high-capacity battery; Dual SD slots; 4K video.
Pricey; Only one slot UHS-II compliant; Dense menu system; Uncompressed Raw capture cuts speed to 12fps; Lens library missing wide aperture super telephoto options