I find it interesting to see comparisons based on clock speed becoming common again. Different architectures behave differently and SPARC performs differenty (read "better most of the time") than x86 at the same clock. I thought people learned that from the PowerPC Macs. I find this supremely ironic coming from a person nicknamed "iigs". Any half competent programmer could make a 6502 run rings around a Z80 with four times its clock in the Apple II days.
"On the other end you have the T1/2/2+ many-core processors that are woefully anemic price:performers except possibly in trivially parallelized tasks."
Like... Oh! web-serving! And virtualization. And database workloads. You must be right: those T1/T2 have no useful purpose.
While Linux and x86 killed Sun on some workloads (it was Windows who killed the Unix workstation, BTW) being able to properly cast hardware to a given problem is a skill far too few people possess these days. Perhaps you should look more closely into your "legacy" Sun stuff and learn about the good parts.