DL doesn't have a bronze level. The lowest level (Silver) would be upgraded (if eligible) before a KLM elite. A China Airlines elite is not on the list for free elite upgrades, but might have very slight priority over the general public if a flight requires lots and lots of OPUPs, although the GA might instead pay attention to fare class (or anything else, as OPUPs are for DL's convenience and are not a published benefit).