Comparative advertising compares one brand directly or indirectly with one or more competing brands. This is very common and is used by nearly every major industry. This type of advertising is particularly resorted to by companies that are introducing a new product in a competitive market. The underlying idea to be told to the consumers in comparative terms could be how their new product is superior to all the existing ones.
Normally the competitor's product is never named directly, but implied. Also the manufacturers have to be careful about not misinforming the public about their competitor's product as it may attract a lawsuit.