the secret to DPA mics is much more than the thickness of the diaphragm.
It has a lot to do with polar pattern control, DPA makes only true 1st order cardioids, causing off axis response to be "pure" and free of non linearities in frequency response. That and the flat phase response of DPA mics. DPA uses no eq in the preamp stage to "flatten out" the mics response as everyone else does. DPA mics also have true "linear dynamic tracking" unlike nearly anything else out there. and much more, way too much to type! But those are a couple of very important attributes.