Okay. I did some searches on YouTube and found quite a few videos where people did some test on different Spray coatings. Some Ceramic, some Graphene, etc., etc., etc. The have a little measuring tool that determine "Glossiness" in GU (Gloss Units?) and the differences were (IMO) minimal. They were all in the 92-96 range. I did notice that the difference in several tests between the Adam's CSC and Adam's GCSC was about 1.5 - 2 GU. The tester was all impressed by that and stated that he could see the difference. Admittedly, I am 66 years of age and my eyes aren't what they used to be but, in the video, I saw little difference. I did see a little difference on my Morris ( the Dk. Green Woody in my sig.) when I experimented with Ceramic boost. Not so much in depth but in gloss. But again that could be my old eyes. IMHO, will the Graphene Coating give you a Rich, Deep, Glossy Shine! YES! BUT, it will be at it's best if you spend the time doing the prep work that is necessary to get as close to perfect as possible. Will there be a difference between Americana/Patriot/CSC/GCSC/GCC? YES...and if experience means anything I know that when something new comes out, I will try it and at least believe that it looks better that last years latest and greatest.
Also, it makes a difference as to what the paint is on the car and your level of satisfaction. For example, My Morris is a Clearcoat and it looks deeper and Glossier that most. The MGB is a recent repaint but is a single stage. It has the Gloss but the depth is not what I get on any car with Clearcoat (IMO) the 52 Chevy is original paint and the best I get with it is with PS and HGG - it is neither Glossy or Deep but it is 68 y.o. paint and I am happy with it.