Hi Oliver,
What is there that you don't believe?
Of course Patek Philippe has a much higher standard of finish on manual wind chronograph, tourbillon or minute repeater calibres than on a 215, a 240 or a 324.
They are not positioned at the same level.
But inside the production of a specific calibre, there is no planned difference of finish.
If you look at Lemania based chrono calibres in the last 20 years, there was an improvement on time regarding the decoration finish. The more recent ones have added inner angles that were not present on the first 3970 issued. But improvement was made at one time and was found in all references in that calibre.
Cheers
Dje