There is the FS Custom Demo, but they won't give it away. Here is what they told me.
Robvia: you can record your own UT2K4 demo. The
command is "record". Then to play it
back in timedemo mode, type "demoplay
[robvia's demo]?timedemo"
I agree, there should be a "standard"
demo everyone can compare to, but if we were to do
that we risk IHVs optimizing for our demos.
Haven't tried it yet. Basacially, I just play online, and type STAT FPS into the console, then I eyeball the average FPS and I'm playing and get an idea of where I'm at.