Very good.
Personally, I like to see 70-72ish under a stress test like Prime or IBT.
This will equate to around 60C at the most under extreme heavy loads in real world use. 90 % of the time it wont reach that though as not many apps can stress the CPU that hard. Looking more like 50ish under heavier gameing loads,
So yea, your perfectly fine. Ideal even.