I don't think it's much better than the 212 EVO to be worth buying one when you already have a 212.
http://www.tomshardware.com/reviews/...nk,3560-5.html
There isn't any direct comparison that I can find, but from looking at this chart which shows the difference between the 140 and 120 true spirit you can see that the difference is between 5-7c.
http://www.hardwaresecrets.com/therm...oler-review/6/
Then you take this which has a comparison between the 212 EVO and TRUE Spirit 120. It shows on average the 212 EVO is 3c cooler than the 120. That means you're looking at the 140 being 2-4c cooler. Not worth it when you already have an EVO.