Sonic differences from through hole metal film resistors and film caps compared to mono ceramic caps and metal oxide resistors are easily heard here. All one needs to do is build an identical circuit and swap the passives.
There are excellent surface mount passives available. The Vishay bulk foil resistors are the best in the world, but you will pay over $10 for just one. Low cost metal film surface mount resistors are also available but rairly used in audio, Michal at Mytek uses them. Ask him why.
Unfortunately, you won't find those parts in modern microphones.
Even with multi-thousand dollar price tags, you still get the cheaper stuff insides from manufacturers like Sennheiser.