Yes, especially because now there is more fine-grained film stock. With optical sound sound quality also does depend on size of the grain - the smaller the grain the better the sound.
But today, as optical sound could be better than ever, no-one is interested any more.
On the other hand magnetic sound always was better than optical sound, so even if a millionaire starts to have a soft spot for optical sound on S8/Single-8 still the question was whether it would pay off in comparison to magnetic sound.
On the other hand optical sound on the film would never fade and it was cheaper as you don`t have to pre-stripe the film...
... i never shot with a sound camera. I once tried to do a sound movie (on the pre-striped Single-8 stock) with a portable tape-recorder (no sync), but i didn`t got the movie finished. It must have been great to have an all-in-one-system with lip-sync sound.