Here’s a screenshots comparison page for NEC’s PC Engine legacy systems. While these systems seem to natively output a better quality of composite video than the Genesis or the Master System, the picture still seems much sharper and less washed out in s-video than in composite. See for yourself!

Down below are some composite video screenshots which will turn to s-video screenshots when you bring your pointer over them. I opted for a roll-over approach so it makes it easy to spot the difference and toggle between composite and s-video at will. All you have to do is to bring your pointer over those composite video screenshots to bring out the equivalent s-video screenshots.