Most of us who are creating or using drone technology are into photography. Some of us make a living from it and lets face it we are all fairly passionate about our preferred brand of equipment. It does not take a great deal of expertise to realise that the DSLR has become the dinosaur of aerial imaging so what is now the current state of the art. With 3DR there is a developing association with Canon but for me my long affair with Canon came to an end some time ago and I think this guy sums up with 10 very sound reasons why Sony has a firm lead in current technology.
CHDK!........ Canon Hackers Development Kit. Canon allows aftermarket firmwire
It's not about the equipment, it's about the results. Different jobs require different tools. Even the DSLR you mention has a place if a clients specifies a specific resolution that only a DSLR can do. Canon, Sony, Nikon, Panasonic. They all have their strengths and weaknesses.