It should suprise nobody that Apple has specifically not released information that says what should be the CPU core temp under load. If they released that information, many more people would be bringing back their MBPs for repair / replacement, which hurts Apple's bottom line. Corporations hide information which may cost them money.
Fortunately, many users are willing to use their critical thinking skills. If the only difference between two MBP's construction is that one has a good thermal paste job, and the other has a sloppy one, and then you see the only operating difference between the two is a 20C difference in CPU core temp... it stands to reason that the sloppy paste job is making the MBP run hotter than Apple intended.
Unless you think the company whose first engineer was Steve Wozniak, who put out the incredible original Macintosh, whose MacBook Pro blows away its competition in all other areas of design... actually intended to assemble their premier MBP line with sloppy thermal paste jobs, after all the bad press they received for this problem in previous MB/MBPs. That doesn't seem credible to me. It would be the day I stopped buying Apple products.