Hmmmm. I don’t have a SD9 to compare color finish with my GP9s. Just in general, I don’t think that gloss lasted very long in the real rail world. A softer (or a bit dull ?) finish seems a bit more “every day” to me. Perhaps someone that has a road with both SD and GP can post us a some side by side pictures for comparison.
Without that, Right now, I’d prefer a non hi-gloss - a more flat paint job.
If you interested, do Google search of 3rd rail SD9, there are great pictures out there
The paint finish looks more model-like and the duller finish hides paint imperfections
Anyways, that's just my opinion,
hopefully these will be great models gloss or flat finish