I'd suspect your knives aren't any different than others in the Case Select line. That line emphasizes additional embellishments to a more-or-less 'standard' Case knife, built in one of their standard patterns. By 'embellishments', I mean things like different blade grinds, swedges on the blades, different shields, pinched/fluted bolsters, special tang stamps and/or etches, exotic scale materials, etc. The basic 'parts' of the knife, like the blades, are otherwise made the same way as the 'standard' line, and with the same materials (like the Tru-Sharp stainless steel, and either brass or nickel liners, and nickel bolsters).
A real 'step up' in overall quality of manufacture would be the Case/Bose collaboration knives. Essentially custom-quality (and priced accordingly), but produced in a production environment. Completely unique patterns, higher-grade blade steels like 154CM, and upgraded handle/scale materials, including stainless steel liners & bolsters. In other words, in no way similar to the the standard line of Case knives, including the 'Select' line.