After reading that YVR is getting a Lufthansa A350 flight I wondered why Toronto never gets the good planes/first class/good airlines. Consider:
Cathay only does business class (YVR gets first via New York flights)
Korean doesn't provide their Kosmo suites in first
Lufthansa doesn't offer first class
There are no A350s to/from YYZ (although Philippine Airlines indicates it will in 2018)
It doesn't get ANA, JAL, Singapore, Swiss (not enough demand? AC monopoly?)
Perhaps it's a simple explanation.