You can absolutely taste the difference between a crappy grinder and a good grinder. I'm not sure what a carbon fiber grinder is, but a proper flat burr grinder

You can absolutely taste the difference between a crappy grinder and a good grinder. I'm not sure what a carbon fiber grinder is, but a proper flat burr grinder that produces a relatively uniform grind size makes the biggest difference in coffee taste, as long as the coffee you're drinking hasn't been burned to ash.