I'm glad you took my mail and made a nice overview about Skia. And there is even more interesting stuff about Skia. There is a Qt backend implementation for it (heavily wip though) : http://blog.rburchell.com/2010/11/qt-on-skia.html
So that really makes benchmarking something highly interesting! Since i personally expect it to beat Qt raster and it has the added benifit of native OpenGL acceleration thus also beating Qt's QGraphics* classes.
Note: I didn't (yet) contact the person making the Qt Skia implementation but it would be very interesting to know how stuff is progressing in that area.