Last i tjeck up on thermal paste where back then i7 920 where the shit to get.
Else i havent tjeck up before this year where i upgadet to that i7 980x and kryonaut is the new wunder dog.
well the i7 920 (i had one... beautiful thing ... ) is Q4,08 and the Arctic Cooling MX-2 was already out

but AS5 was still supported by many (with reason at the time, after all the differences were minimalist but still in favor of the MX-2 and many reviews at the time did give the MX-2 as "the one to get") and is still supported nowadays (without any reason than "brand fidelity") 3.5g syringe, lower density than many concurrent and well inferior in many aspect, it's not a bad TIM but it need to stop being recommended so many time (the only cons of the MX-2 was, that it was a bit thick and difficult to spread )
user A: "i wan't to OC my CPU what's the best TIM around?"
user B: " AS5! AS5 is the one to get, non conductive, easy to apply, high Wm/K, and price to G ratio excellent!!!" (while it has been shown to be conductive well capacitive technically but that mean it's still just as harmful as a conductive past, needing special application method, lower Wm/K than the lowest one from TG, and price to G means nothing, price to ML on the other hand ... )
userC: " well from good to excellent with pricing going up: Arctic cooling MX-4, TG Hydronaut, Gelid GC-Extreme, Cooler Master MasterGel Maker Nano and TG Kryonaut"
user B: "but AS5 is cheaper, thus better ... and is also made in USA

"
user C: "if you OC, you don't cheap out specially when the OP ask for the best TIM around, and last part of your sentence is irrelevant ... except maybe for Trump

"
(sorry i couldn't resist to push some lame joke in my "example" ahah )
actually i use the CM MasterGel Maker Nano atm on my 6600K quite similar temps in idle/load than the Kryonaut and albeit being a "nano diamond" past, it behave quite good (unlike a certain brand)
the top dog are these 2, since i can find ample supply of both were i live only the price make them different and the "CM MG M N" cost a little less.
(i still have all TG TIM in my drawer alongside the "CM MG M N"leftover of GC-Extreme and a brand new unopened tube of ... AS5... )
as you can see most of my TG seems near full but, the Aero saw 2 application, the Hydronaut saw 4-5 application and the Kryonaut saw at last 3 application (going by price ... getting the same application count on the AS5 would have needed more 3.5g tubes and also probably would cost more than a Kyronaut tube

) the GC is almost empty but still left for 1 or 2 i think the CM is at 2 application (still quite a lot left) AS5 is new (bought it for collection purpose and also to have some to compare if i really needed to ... well i didn't ) Conductonaut is new (not ready for a de-lid ahah )
the funny part is the GC and CM pack 4g while the AS5 3.5g ... by the size of the tube ... i rather say 2g

manufacturer need to let down the "g" and start labelling in "ml" to be more accurate due to density variations.
if not finding TG Kryonaut, the best second would be the CoolerMaster MasterGel Maker Nano, the third the Gelid GC Extreme and the fourth Prolimatech PK-3, being on a budget: Arctic MX-4 and Aeronaut depending the supply
priceless
22.06.2011
"For the longest time, Arctic Silver 5 was known as the pinnacle of thermal paste and its sibling, Ceramique, was also highly regarded for being the best performing paste without any conductivity/capacitance qualities. Things changed a few years back, however; Arctic Cooling MX-2 came on the scene and exceeded Arctic Silver 5’s performance while also not being capacitive. "
statement from 2011 but specify a "few year back" (2008 indeed )