OK, let's go:
Here is one where a P4 2 Ghz is pitted against my G4 867 and the outcome is more than unclear. The P4 wins most tasks, but the G4 beats it with around 60% in color reduction. To me, a rather pointless benchmark, since a P4 2Ghz should not be compared to a 867 but to a Dual 800 IF YOU COMPARE THEM (you know my opinion about this). There the outcome, if you ask me and if you look at the numbers, would be clear and the price tag would be the same (IIRC the P4 2Ghz is quite expensive, with a good casing, a GeForce 2 MX, a DVD-Burner, a 60 Gig HDD, Firewire etc. etc. you should be close to the Dual 800).
http://www.techtv.com/print/story/0,23102,3339307,00.html
A very good read is this. The architecture of the P4, a bit of the AMD and the G4 are compared, showing the big points of the G4 and P4 and also the drawbacks! A GREAT ARTICLE, but not easy to understand. After this, you will understand my "FXCH is no longer free" joke. After this, you will see that Intel carries around 10 year old technology...the processor stack!
http://www.arstechnica.com/cpu/01q2/p4andg4e/p4andg4e-1.html
Actually, I don't have a site for the AMD against G4. I have some magazines which compare them, and to P4s. My "feeling" towards the Athlon XP is that it simply has the architecture the Mac community is waiting for...the G5. But still, I am proud that the G4 can hold up to the Athlon XP and, in some cases, beat it. Again, the question is, which processors do you compare? On the PC side, you compare similar Mhz counts, but on the crossplatform benchmark? Same Mhz counts? Apple wins due to the shorter pipeline. Then again, at the same time Sun would completely stomp Apple due to the higher FSB compared with the shorter pipeline. Compare the same price tag? Not possible, since Macs are prices as a package. Compare the top processors? Also not possible, since Apple doesn't release the fastest processors they have due to marketing...sure they have the Apollo G4 at Ghz counts ready for the fact that the G5 AGAIN is not finished...and they Apollo G4 will be released in January, believe me, sadly again with 133 Mhz FSB...the RAM then can no longer feed the processor fast enough...Apple knows this, and that's why they can't wait to release the G5...
This is what I have to post here, the rest are magazin benchmarks...