I think Sony didn't gamble that much on mirrorless, and were already in a good position to make it happen. They had a CCD/CMOS group company since the 80s and

I think Sony didn't gamble that much on mirrorless, and were already in a good position to make it happen. They had a CCD/CMOS group company since the 80s and started using them in video cameras. From there they also produced sensors for feature phone, smarphones, and mirrorless was more or less an extension of that