With the newly released Alpha 3 of the development version for Firefox 3 (Gran Paradiso) I tried the SVG rendering to compare it with the current Firefox (well, current as provided by Fedora, but I do not expect major differences in FF 2.0, it has Gecko 1.8.1).
As a sample, I used my remix of Mairin's design for the Flying High round 2 theme.
This picture is worth 1000 words:
click to enlarge
It looks almost identical (at a quick look I can't see any difference) with Inkscape's rendering.