Electronic Shutter will introduce "jelly" or "stretched" effects unless used in very high shutter speed, this is due to the fact that CMOS sensor reads the pixel line by line, and the longer the line is read, the greater the horizontal stretching, whole or partial, will be.
The solution to this was the CCD sensor which reads every line concurrently, hence its former popularity in cinema circles until CMOS high sensor turn into magnificent ISO beasts.
So for long you use a CMOS sensor it will not act like it has a global shutter, any future tech to alleviate this effect will be based on reading the same exposure multiple times within the designated shutter speed rather than reading it once in the desired shutter speed.
If you want silence then I suggest to buy either one of the X100 series or the new X70 since they have leaf shutter, I use the x100 which has an abysmal autofocus which means I always get noticed before I got the focus right but I guess the newer T as I tried it was so fast it would get a pic before anyone noticed.
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