Sony's brand new A9 is the most advanced camera that the company has ever made. In a lot of ways, it's the most advanced camera ever. It's a hell of a lot of power in a relatively small and unassuming camera. It's built for the highest of high-end professionals, sports photographers with the need for speed and the need for quality. It can fire off 20 frames in a single second, before you even realise that you're pressing the shutter button.
I, however, am just some Guy With Camera; I do not deserve a camera of this quality and with this feature-set. Nonetheless, here's what I learned in my time with a $7000 camera and even more than that again in high-end lenses.