That's totally correct! I once replaced some blurry scans from the 6502 manual by SVG versions, and, while I was at it, I coded them by hand (really, because for this particular job it seemed easier than doing it in a drawing program.) While nobody will notice, it's satisfactory.
Nobody will notice, because that's how it should be... personally I often notice when it's bad: blurry plots, JPEG noise that should not be there, and so on, and think "oh no, another one who has no idea about how to do images properly..."
90% of your users will benefit from it without even realising. 9.9% will silently appreciate it. If you're lucky, the remaining 0.1% will tell you they appreciate it!
