I actually have a project right now that is a mixture of CT batiks and some from LQS. I read this thread and went and looked. I could not tell the difference in the blocks. I looked at the FQs I had left after some investigation I could find a difference. Now, all of my fabrics have been washed and starched. That could be what makes the difference.
I am not a fan of batiks in general and would not be sewing with them if I paid full price. I bought the CT collection half off at Christmas and added some more expensive pieces to the collection for the quilt I am making. I can't wait to be done! It is a gift but I pretty much hate it.