I have been close to HONDA, Yahama and Kipor generators
The Yahama was at a rally, lots of "People" noise but the 2,000 I could barley hear at low power levels and I know how to listen, at half load it was easier to hear, at full load we could hear it clearly. Only at full load did we have to raise our voices and I was close enough to feel the exhaust hitting my leg.
Honda is 1DB louder per the spec sheet (1db is not significantly different)
The KIPOR was out in open land, not nearly as many people. the sound quality was much different... Overall volume was the same but due to the different quality it was much, much, more annoying. And I was at quite some distance from it.
The Yahama was an EF-2400i by the way. At full idle even I could not hear the 1200i over the people noise, but I could hear the 2400... I am very used to hearing sounds covered by noise by the way. Both professionally and by hobby I talk on and listen to radios.. I'm used to hearing voices covered in noise.