Lens

Sony FE 40mm f/2.5 G

Used by 1 documented creator on Lensbook
Who uses it
The creators running this lens
Jason Vong
Jason Vong
Talking-head / Hybrid (photo + video) tutorials

One of the three compact G primes in his kit (24/40/50mm at f/2.5/2.5/2.8) — same physical size, near-identical filter threads, designed as a matched-set trio.

Source: What's In My Bag: How YouTuber Jason Vong Uses a Sony Alpha Kit for Vlogging — Sony Alpha Universe reported
Budget alternatives
What creators suggest as the cheaper pick
Sony FE 50mm f/1.8
Suggested 1× across the documented setups