Raw to jpeg in lightroom 4.3
Personally this image really reminds me of The Thin Ice actually. It's very representative of The Wall imagery.
Is boosting contrast and sharpening in lightroom considered significant post processing? Most of my photos go through at least something in lightroom
This is an amazing photo of an amazing event, which I was sad to miss as an astrophotographer myself. But it doesn't have star trails (unless you count in the tiny enlongations due to tracking the comet)