I grabbed screenshots of the top 10 on every in-game leaderboard on every platform. Sharing them here for those who want to compare their times.

Google Drive folder (don't know of a better way to host albums, sorry)

UPDATE—I've dumped the entire PS3 leaderboard as of 2024-04-09. You can find the data here: Google Drive

Couple notes—PC is generally best for comparison since people on PS3/360 often have times faster than what's possible via time trials. Only a couple times on PC are like this and they stand out enough that you'll know. The PS3 runs are real despite the times, which are possible because they went online and abused drafting to get better times.

Another thing is that PC has cheated times using trainers and stuff. You'll be able to spot these pretty easily most of the time. If there's some confusion as to whether a time is legit, you can compare to catty7073's times since most (if not all) of their runs are legitimate and they're usually near the top. Alternatively, you can ask me about it here or on Discord, because I was around when ghosts worked and mostly remember which runs were cheated.

Anyway, that's it, hope this helps some runners out there set some targets.