My FB posting on Sony A7RII announcement:
Product cycle, Moore's law and the new "Sony" law in Cameras. Gordon Moore said the number of transistors packed in an integrated circuit doubles every two years, it was translated by marketeers and commonly stated that you can get a computer with double the power every 18 months, or buy a computer with the same power at half the price, over the years we see this happened; computers are so powerful at low cost (not only computers but gizmos like BluRay players etc)
For Cameras, photographers were used to Canon and Nikon product cycles, cameras got replaced in three years or more and you can rely on your old cameras for 5 to 7 years.
Not anymore in December 10, 2013 Sony new Mirrorless 37 megapixel Sony A7R hit the US market, I got my camera in Manila on Feb 8, 2014 then Sony announced the A7S with super sensitive sensors that can shoot at ISO 104,000 and more, a few months later the A7II was announced with 5 axis stabilization built in camera. These announcements were nice but did not bother me, the A7R was still the king.
Today ,in 16 months my A7R is "obsolete" Sony announced a new A7R II with 40 megapixel back lit sensor, better image quality, more ISO capability, fast autofocus,silent shutter, 4k video and 5 axis stabilization. Sure the old A7R still shoots amazing high resolution images but the new version corrected some of the shortcomings like AF with Canon lenses using adopters.
Sony is setting a pace in camera life cycle, they are breaking the slow R&D of Canon etal, good news for consumers in one view but bad for resale values of old gears. The A7R sold in Feb 2014 for $2,200 today the new A7RII sells for $3,200 both for bodies only.
Will Sony announce another break through in 18 months? What new technologies will we see by Dec 2016.
In comparison the Canon 5Ds and R announced 4 months ago are just hitting the stores now. Sure it has 50 megapixels but shoots at low ISO compared to three year old Canon5D3. I was looking at upgrading to the 5Dr but with the new Sony A7RII for sure not anymore.