The "sensitivity" thing is a popular myth among podcasters. Headset mics use higher-sensitivity condenser mics, but because they're so close to your mouth, ambient and background noise is proportionately far quieter. More reading on this topic:
• Myth Busted – The Too Sensitive Condenser Microphone: https://www.homebrewedmusic.com/2009/12/30/myth-busted-the-t...
• 15 Popular Audio Myths (see section "Myth: Capacitor mics ‘pick up more of the room’ than dynamic mics"): https://www.soundonsound.com/sound-advice/15-popular-audio-m...
• Top 8 Microphone Myths Exposed (see item 6, which also applies to dynamic vs. condenser): https://www.shure.com/en-US/performance-production/louder/to...
The 1khz/1Pa test is nearly useless on its own and generally in the studio when the engineer says this mic is more sensitive than that one, he is not talking about the sensitivity measurement on the box, he is talking about the sensitivity measurement in context of of the pattern and frequency response for a given setup.
Edit: that is too say I was not talking about the sensitivity measurement on the box either.