B3's do run hot
Like said above, do a prime test to load test it.
Is your room hot? Because my setup (B3 Tuniq Tower@ 2.7) idles around 45c in core temp, sometimes a degree or two more when my room is warm ( 80+ degrees F)
However my load temps on prime usually will only jump 8 to 12c, small fft.
I wouldn't worry unless your load temps are high.
I also believe all this comparing of temperatures is pointless because in just about every case the test set up will be different. Higher, lower ambient temperatures, different cases, different computer builder, different thermal paste, with everone having a different way to apply it, and different fans, not to mention, not all pieces of silicon are created equal, will give you a differnt outcome than the next guy.
Phew sorry about the run on sentence...
AS long as you stay at or below 60c I wouldn't worry about it.