Didn't they do the whole Mac vs. PC campaign a few years ago? Sure, they didn't point out a specific brand, but on more than one occasion it seemed very obvious what product/company they had in mind.
That was when they were the plucky underdog, like with IBM before that. They certainly aren't (and wouldn't accept opinions to the contrary) an underdog to Samsung.
Also, "PC" was never a specific company. You could infer things like Microsoft or Dell or HP or whatever, but they avoided specifically naming a company.