SIenabraun looks much better in fresh paint, especially in the sunshine. It has a sparkly cinnamon vibe to it -- rootbeer was a good description. That said, it is still brown and will not turn heads when parked among its brethren with brighter plumage. And for some reason, the big bumpers look even bigger on Siena, don't ask me why.
I had the same struggle with my Pastellblau. When I got the car it was dull as Lake Michigan on a January day. I thought about painting it another color but couldn't pick one so I went with the 'blau. With a shiny coat of paint and new shiny trim, she sparkles.
Ultimately, it's up to you. If you want to strut, change the color. Just don't create another Inka, the Brittney of 2002s. If you are a bit low key, want to be true to the car, and only care if you please yourself, a shiny Sienabraun might be just your color.