Comparing it to your patched F14 version, the roman typefaces look quite different, but overall I can't say I prefer one to the other. The italics, on the other hand, look much better in your version.
There is one strange thing in your F14 screenshot, though--the upper left of the lowercase letter 'a' is straight horizontal, rather than curving down as it does in all the other screenshots, both yours and mine.
Your Ubuntu screenshot looks very similar to your F14 screenshot, but not quite identical: see the dots on the lowercase i, and the above-mentioned problem with the lowercase a.
Personally I can't really tell the difference, but I'm guessing this is the patented hinting algorithm? If so, Fedora can't ship it, because Red Hat is a large US-based target with lots of money. However rpmfusion is available for those of us in the free world:
Open this page: http://www.infinality.net/files/font.html, set the font to "DejaVu Sans", and scroll down to 14px.
Compare to these screenshots:
- Fedora 14, patched as above: http://imgur.com/Y2JV1.png
- Ubuntu 10.10, default: http://imgur.com/2WgdM.png
- Mac OS X 10.6.4, Firefox: http://imgur.com/KGK7T.png
I'd appreciate if someone posted screenshots of this page with default unpatched Fedora config, and with unpatched subpixel-enabled Fedora.