Too bad they didn't test the PPC G5 dual core chips. I'm curious.
The problem of course is that the applications and OS's are different so you wont be able to make a true direct comparison.
Any processor that is tied to a front side bus is going to be second rate. I have developed a soft spot for IBM, since they have been working with AMD, they power quite a few computers around here, and of course they get launched into outer space all the time. Yes it would be interesting if they could do it.