I had a Base model with a right hand side bag. I suspect my bag moved around more than your tank bag would. Given that, I was not happy with how the panel got "destroyed".
I also had the bike in for first service and they wiped the tank down... The result was... in my eyes... scratches everywhere.
These bikes have very soft paint and scratch very easily.
I ended up getting the whole bike detailed and ppfed / ceramic coated. I was extremely happy with the results. I had the bike for a little over a year after getting that done and I was so glad I did it. Especially when I saw other bikes, R18s in particular, with scratches and swirls. The black paint looks soooooo good when it's pristine.
It is pricey though, but for me it was well worth it.