Mac has long claimed to run Photoshop "faster" than the PC. Whether or not this adds up to any kind of real world advantage in the graphics world is debatable ('cause the fastest PC is no slouch with Photoshop!).
There is definitely a squatters mentality in the graphics world. You will hear the same old tired defenses of the Mac vs. the PC even though the times have changed and ANYTHING one could even wish to design can be done on the PC now. The old service bureau shut-outs are over. Adobe has obliterated any differences between the Mac and PC versions of their industry-standard design programs. Open type will further knock down barriers created by incompatible fonts between platforms. Etc., etc...
Since Mac has traditionally dominated the graphic design market, I would be very worried if I were them. Eventually, the fear of change they so heavily rely on will evaporate.
I'll say this real quiet, so as not to start a flame war, but Apple is wrong (or, if you're cynical, lying) about the speed of the G4. By almost any benchmark you like, the fastest PCs are between 25 and 50% faster than the fastest Macs. Including Photoshop benchmarks - if you look at an objective benchmark like PSBench, and ignore Apple's very carefully hand-picked filter "benchmark". Got it? ;)