Originally posted by Fogel70 Yes, and this is true both with or without images stabilization.
If you use a 50 mm lens on a FF camera without stabilization you might be able to use 1/25s with a 12MP sensor and get pixel sharp images, but with 42MP you might have to use 1/100s to get pixel sharpness. With 3 stops stabilization you then can use 1/3s with the 12MP and 1/12s with 42MP camera.
The images stabilization is only compensating the camera shake, and that do not change with resolution of the sensor. But higher resolution on the sensor will put more demand on how steady the camera is to get pixel sharp images.
A 42MP sensor will not be less sharp than a 24MP one in the same shooting conditions. At worst the condition as not good enough to get more than 24MP worth of detail and you'll be limited by the shooting condition (the lense, it's apperture, camera shake, noise).
So say if the picture was not so sharp and is worth for 8MP only, it will look sharp enough for a 10x12" print viewed from 10" away. This will be valid both for the 42MP sensor and the 24MP sensor.
In reality of course, this is not true, the 42MP sensor will be a bit sharper because there you'll loose less in the conversion to the digital image.
But if by any luck the condition are better and allow to get more than your 24MP worth of sharpness, the 42MP sensor will allow you to benefit of it, while the 24MP would not. This will be completely useless in many cases: internet sharing, printing at size smaller than 24x18", consummer grade teles/UWA, shooting at large or very small appertures, high isos settings. In some cases it could proove usefull: iso 100, huge print where people will stare at details, heavy cropping, pro lense used at it's best apperture...
By no way a sensor with more resolution is more demanding. It can provide more in ideal conditions, but doesn"t provide less in other conditions.