@tag Thank you for the feedback.

the CPU temp is shown as 0.049c instead of 49c

I have filed an issue with pi4j. Seems it's fixed. Let me check with recent version and update.
https://github.com/Pi4J/pi4j/issues/356

Which image do you use (in my opinion armbian jesse is still the best..)

Yes, I too use armbian. Which is super cool image for Orange PI

and what is "hot" can you keep your finger on the cpu for a minute?

Sure, Will update you