A rather strange answer if you dive into into the consequences of FF and M4/3 sized sensors.
Not at all. The shooting experience is identical you won’t see any difference and depends more on the brand model you use than the sensor size
Sensor size will not bring any difference to the video signal you see in the evf or lcd
But that was the same with dslr looking at the viewfinder you wouldn’t be able to judge anything about what’s in the camera
As most features in mirrorless are software driven the ability to model exposure focus etc relates to the technology of the manufacturer in processing the image pipeline
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