The Pentium M is getting Photoshop numbers that compete with the A64 FX-series chips as seen here:
http://www.gamepc.com/labs/view_content.asp?id=dothandesktop&page=13
The 2.0 Dothan is just 4 seconds shy of the FX-53.
Considering the FX-series chips are in the same realm as the G5's, I have a hard time believing that the G4 is "1.3x faster" or even just being
competitive to the Pentium M (Dothan core). I'm not talking bout the Banias core, but the better 2MB L2 Cache Dothan core.
http://www.gamepc.com/labs/view_content.asp?id=dothandesktop&page=11
Likewise, in gaming, the Pentium M "735" 1.7Ghz model (lowest one) is getting better frames in Doom3 than a Prescott 3.4Ghz (123.3 vs. 122.4). Even more suprising is that in Far Cry, the Pentium M 735 1.7Ghz gets higher frames than even the 3.4EE (extreme edition aka Xeon) >> 110.6 vs. 107.7
With those kind of numbers being produced by the Pentium M, I don't think a G4 is even marginally close. Only the G5 will be able to close in on those numbers.