You may want to check the
weight of the eggs. Eggs are sized by weight strangely, and CL eggs seem more dense. Grant you a particularly small egg cannot weigh a lot....but the other day I was surprised that an egg that looked 'medium' to my eye was
over 2oz which puts it in the "Large" category.
This charts and quotes page has some weights:
https://www.backyardchickens.com/a/charts-and-quotes
Another interesting thing, is that when I broke a store-bought egg (still left from before when my own chooks started to lay again)- and one of my own eggs, the size of the yolk in comparison was much larger in home grown, visibly larger by about 40-50%. It would seem that the yolk would be the part of the egg that contains the most nutrition -so I would think it would be an advantage.
Again, egg "size" is based on weight - and it could be that CLs have a denser egg than some of the other breeds. Now this isn't to say that a tiny egg would be more marketable than an enormous egg -- but it depends on if you want quantity or quality as well as just the looks.