An invalid comparison. The PPC Macs are outdated hardware from 2006, the X1000 is brand new hardware! As such the X1000 should be compared to current hardware.
From the A-eon website:
The X1000 ends the years of AmigaOS being relegated to a ghetto of outdated hardware - great as it was at the time, the world has moved on a long way since the days of Commodore. For the first time in many years, AmigaOS has a genuinely modern hardware platform.