Originally Posted by RealHJ

For some reason, the 747-8i temperature, at least on the upper deck, is consistently better (and almost comfortable) on KE, as opposed to their other aircraft (or OZ, JL which are both miserably hot also).

Just don't count on the KE aircraft you book being the one you fly. KE does change aircraft. Your 747-8i flight could be downgraded to a 777 with 2-3-2 old angled lie flat (like NW WBC) Prestige Plus or 2-3-2 also no direct aisle access Prestige Sleeper. It's the Prestige Suites that have direct aisle access, and some KE aircraft have it, but a lot of aircraft (esp. the 777s) still have Prestige Plus (angled lie flat 2-3-2, only slightly better than OZ) or Prestige Sleeper (true lie flat, but where every aisle seat will have someone crawling over you, as again it's 2-3-2).

As a SkyTeam Elite+, you may get upgraded to the first class seats on KE...but that is highly YMMV, and generally only if aircraft has first seating, but doesn't have first actually sold on that route, so it's the same service, just better seats for those seated at the very front. (I believe KE first upgrades their own elites, and then if any seats are left over ST E+.)