I have. Keep in mind that Quake and Painkiller take place in small, mostly indoor maps.
So are you talking specific player movement, the feel of speed compared to the surroundings or just the overall pace of the game?
They are all relevant and contribute to the feeling of speed. You can have the fastest characters ever, but if it's on a massive outdoor environment, it's not going to feel fast.
The only character in Tribes that was fast was the Light or no armor/loadout and they weren't that fast unless you got airborne and started skiing. Medium and Heavy armor loadouts were not fast at all.
Tribes also had indoor environments that you could not Ski in to gain speed. The gameplay indoors was significantly slower than that of Quake or Painkiller.
So no, Tribes is not what I would call a "fast" game, certainly not the "fastest ever".