The only carbon fibre I've used, which were pre-impregnated sheets laminated together, had an attractive "trellis-work" pattern - like cross hatching. This, pleasing in itself, might make reading your engraving a bit difficult.
I suppose it would depend on the scale of the work compared with the size of the sheet pattern.
PS I found it an incredibly abrasive material on the tool edges. Mind you, I was using a 9 thou piercing saw blade with 100 teeth to the inch.