I'm trying to hard to understand and like this camera, but I can't see any reason to buy this camera over the RX10. The RX10 outperforms the XC10 in almost every aspect and at a fraction of the price. The RX10 has a constant 2.8 lens vs the XC10's variable 2.8-5.6 lens. The RX10 is much smaller and better for drone work, it has better slow motion in 1080 and options for up to 960 fps and can capture 20MP RAW stills with bursts up to 14 fps.
The $1300 RX10 camera is clearly superior to the $2500 dollar XC10. To me, the XC10 is only worth 500-800 dollars. Even at that price, I still wouldn't buy it. I keep hoping that Canon would step up and compete, but I'm losing hope.