Benchmarks of what though? Basically any application that sees a 50+% boost from HyperThreading would be better off with 6c/12t. Everything else (which includes the majority of applications) would prefer 8c/8t. This assumes you're running a single application though; 6c/12t may well be better for multitasking in some situations.
Looks like a moot point now. I suspect you're probably correct, but I think it would have been worth looking at how much of a difference it makes in both directions