>>2924947
it depends on how the part was made but also how much force you actually put into trying to scratch it
for example, in that pic is an OEM part built by a composites engineering company for porsche and uses all the expected techniques and processes for a company of that kind to make the best possible carbon product
if you compare that to a guy making parts out of his garage, his parts will be much easier to scratch because his materials, processes, etc. aren't as good so the product isn't as good

if i had to take a guess, i'd say that if you took a knife to that part you'd really have to put in a bit of effort just to make a noticeable scratch but you wouldn't be scratching the carbon itself, you'd just be scratching the resin on the surface, which can easily be fixed just by sanding and polishing it - the structural integrity wouldn't be affected at all
obviously if you used a more destructive tool with more effort the damage would be greater and that's true for all materials but you can even find videos of people "testing" the strength of their carbon parts by smashing them with sledgehammers and only creating tiny scratches on the surface