Sony a9: Why being better might not be enough

The Sony a9 is an impressive looking camera. At 20 frames per second, it's able to shoot much faster than either of the professional sports cameras from the two big DSLR makers. The Sony is also smaller and lighter than these cameras (even with a battery grip added, to get nearer to matching their battery endurance), and has autofocus coverage across a much wider region of the frame than a DSLR AF system can offer. On top of this, it’s $1500 cheaper than Canon's EOS-1D X II and $2000...