You're shifting the goalposts - I don't blame you, but the original claim was that a 1.25 GHz G4 would match a 2.5 GHz P4. Sorry, but no.
I'm not. My claim was that a G4 is faster than a P4 at the same clock, and that's true. The G4 line will never be able to make up for the clock speed difference between it and the faster Pentiums and Athlon/Opterons -- that's why we have the G5.
But it is cheap and runs very cool, so it has a good place in the small, cheap computer market. About coolness, the 7488 (if they use it) has a thermal dissipation of 10 watts at 1.4GHz, vs. a Celeron at 2.2GHz (likely comparable performance) taking 57 watts.