I wonder if Servo is advanced enough to get some performance numbers on large pages compared to other engines. In any case, I'm looking forward to see what becomes of it. Like Rust, it seems a well thought-out approach to solving difficult problems.
We're not publishing comparisons with other engines for now because we don't support the full web platform yet in Servo and it doesn't make for a fair comparison against them. Certainly, we benchmark against other engines internally and try to ensure Servo's page load times are at least as fast as the other engines. That said, we don't have incremental layout yet, so Servo is _way_ behind on any measurement involving dynamic page updates.
Lots of good progress, but we also still have lots of work to do!
(shameless plug to solicit contributors: https://github.com/servo/servo/blob/master/CONTRIBUTING.md )