Yes, I do notice a difference in the mascaras in Dior Mascaras. I don't buy the one that is in the big tube any more. It got globby fast. I don't know why, but it would only take a month. I would have to pitch it.
I use the slim tube one - Dior Show Unlimited. It's better. It's easier to control, because it doesn't have that huge wand at the end. The wand does have different sides to the end, so I get both long and thick eye lashes.