Full Frame ?? is it Worth the Cost

[Chris L]

Yes exactly, but it also allows for a much slower shutter speed to allow motion blur and movement.

Gary.

I know but your earlier post only referred to sharpness

Since the maximum f/stop available is limited by the lens and not the body this still isn't a pro or con for either format IMO and you'll still be getting a deterioration in image quality due to diffraction regardless of the quality of the camera used.

That's why for example a photographer striving for a higher quality image using long exposures in landscapes will see better results using neutral density filters to reduce the light as required whilst checking the hyperfocal distance of the lens and setting the aperture within the sweet spot for sharpness and image quality.