[Brightcolours]

Raw bits are not in any way similar to JPEG bits. JPEg stores values in a linear fashion, where black is at one end, red green or blue at the other end, and a mid tone in the middle. For each R/G/B channel 8 bits are used

With RAW you have a very different exponential scale where doubling the light doubles the value, making the information density on the bight side much higher than on the low values dark side. 

 

So, it is not simply 8 bits of JPEG and RAW having 4 or 5 or 6 bits "headroom".

 

And again, shutter shock shows up with Sony/Olympus/Pentax cameras with IBIS. The Canpn has no IBIS so no sensor to move with the shutter shock. That the Sony A7R's IBIS and shutter made for a shutter shock combination does not mean that the M5 without full electronic shutter has a shutter shock issue....