For a race bike, the best carbon fiber component is the one that has the least weight so the manufacturer should use the minimum amount of resin and no clear-coat to save weight. Unfortunately, this also results in pinholes in the surface and a somewhat dull finish. You may even be able to see light through it in some areas.
However, for a street bike, a nice appearance is a more important concern than weight savings, so fit and finish is essential.
In terms of overall appearance, carbon fiber made by Carbon Dream is widely regarded as the best product. They use prepreg carbon fiber and a autoclave instead of a cheaper wet lay-up process used by other manufactures. Their products are quite expensive.
http://www.carbondream.it/menue.html The other major manufacturers are Casoli, QB Carbon, Ducati Performance, Sebimoto and Carbotech. I believe Motowheels carries the line of carbon fiber manufactured by the supplier to Ducati Performance.