Looks about as good as this:
Better than any telescope Galileo had, I suppose.
Some readers may misunderstand. What is pictured is not a shadow of the Moon or anything else falling on Saturn. You can see the illuminated part of the Moon but to its right is a dark portion that blends into the dark background of space. Saturn is pictured partly hidden by the darkened portion of the Moon. An observer on Saturn (more likely on one of its moons) would see (in a telescope) our Moon as a partly illuminated crescent in front of the earth with similar light and dark areas.