Granted the new liter bikes are quick but according to some published 1/4 mile times by reputable bike mags it seems the Busa is still king of the 1/4.
In the recent Sport Rider (June 2004) they put the 04 liters head-to-head...the results:
CBR: 10.16 @ 142.1
ZX-10: 9.92 @ 147.4
GSXR: 9.96 @ 144.7
R1: 9.93 @ 147.4
In June 2000, Motorcyclist ran the Busa to:
9.86 @ 140.3
In the same month, Cycleworld ran it to:
9.86 @ 145.80
I do not have a copy of those (Busa) tests so I assume they were bone stock.
The point here is the new 04's were built to compete against the GSXR1000 not the busa, and considering most of the these new bikes have the aerodynamics of a wiffle ball I doubt the Busa has anything to worry about on the top end...but even if someone eventually knocks off the Busa then keep in mind that it took 5+ years for them to do it.
Just my $.02