I suspect that the finish has morphed over time, because I've seen at least three versions, but very few like my Roadster with the dappled low key Hammerite look.
Some do have a slight sheen and I would be very careful applying any sort of polish/abrasive because it has the potential to make the finish go patchy. I had this problem on my 2012.
The simple grey primer version is probably easiest to look after.
I've always wicked some ACF50 into the bolt hole recesses as I think the paint breakdown starts there
