Okay, so why do we want a global shutter for action/bird photography? I know GS eliminates rolling shutter distortion, but Sony has shown that fast readout does the same without increased noise and a hit to DR. I suspect GS if it is fast enough and if it has sufficient DR is probably the end goal, but the KISS principle suggests that very fast readout gets us most of the way (all the way?) there with existing and proven technology.
The main advantage to a global shutter is that it is like a mechanical shutter with no moving parts and infinite actuations.
DR is sacrificed at the maximum burst speed for a rolling shutter as well.
CMOS GS in proven tech at this point.
The documentation that was provided in the link I posted up-thread is the best comparison between rolling and global shutter since it is the same processor that can switch between modes.
The rolling readout is 10ms which is crazy fast and the global shutter DR has 16+ EV.
By the way, for long exposures, a rolling shutter would have the same noise and DR as a global shutter since the entire sensor will be on most of the time. There also would be no rolling shutter works.
Also, the whole sensor is on when using a mechanical shutter.
It still turns the sensor on one line at a time but the entire sensor is on before the shutter opens.
Thanks for making me explain this.
It made me realize that a global shutter does not 100% replace a mechanical shutter.
Canon uses the shutter to protect the sensor so I do not think they will remove it unless they want to swap it for internal ND.