These cpus are more exotic.
http://www.terrasoftsolutions.com/products/ibm/qs22.shtml$1895 (1200€) wouldn't be much expensive if AmigaOS/MorphOS really ran on it. Compare it to uA1/A1 prices (just motherboards). It's a full computer... unfortunately it doesn't run OS4/MOS so it's totally useless and offtopic for Amiga users.
Mac Pro costs 2450€ in Spain. That's almost twice. Yeah, it's twice the number of cores, but twice the price.
On AmigaOS multiple cores are useless.
For AmigaOS I could live with a single core anyway. Just bloated OSes like OSX require multiple cores to multitask smoothly.
Mac users can visit macworld or something like that to brag about their wonderful 365375-core cpus unless they are planning to port AROS/OS4/MOS to their wonderful machines.