in my view, the difference between Patek and other brands is that on the latter there is an easy association, for example:
Rolex: oyster case, bubble date
AP- Royal Oak (shame, their grand comps are incredible but it really has become the OO company)
JLC- Reverso
with Patek, I thin there are many different associations:
Nautilus
24
Aquanat
Calatrava
Gondolo
BUT- the I believe that the reality is that perpetual chronos and minute repeater tourbillons (small seconds, mechanical) have an aura and quality that is exceptional (and are advertised quite well, with all the application business which is really a variable notion etc) that affects perceptions across the range, cascading to everything else. If there was no 1518, 2499, 3970, 5970, 5004, 3939, 5016, 5207 im not sure the brand would be where it is today
just my 2c!