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Yes I did something like that on a 2xE5-2670v1 a while back (32 independent tasks on hyperthreads) and got about 20x speedup vs single thread. That is, 20% speedup from hyperthreading, or 1 hyperthread = about 0.6 full-core single thread.
This might be of interest:
https://www.worldstream.nl/en/dedicated/custom/order/Intel_Core_i7_2600K_3_40GHz
i7-2600k, 8 hyperthreads, 8479 passmark, 21.80 euro at discounted yearly rate = about 2.54 euro / kilopassmark which marginally beats the 2x E5-2670v2 even if you count it as 30k passmark.
Yeah, that setup is very competitive in terms of kilopassmark's, but the lack of cores makes it less attractive, as while the $ per passmark is great, the $ per core is still not great ($153 USD at current exchange rate versus $84 for 20 cores). For some of my use cases I can get away with running tasks on faster single cores for a shorter period of time, so utilising some benefits of the faster machine, and justifier the higher price per core, but for other cases I can't as easily do that, so on average 20 cores at say 2.5ghz are more useful to me than 16 at 3.2ghz even though their total 'killopassmark' might be closely equivalent.