I modded my Sega Saturn with an S-Video port! I know the Saturn has S-Video cables you can buy, but I wanted to have something that didn’t require the Saturn’s proprietary input.
I could show comparison shots all day but here are just a couple from Street Fighter Zero 2, comparing coaxial (ugh) and s-vid (yay)! Obviously coaxial is going to look like ass, but even if you’re using composite then S-Video is a dramatic step up. So bright and crisp.