The F2 is loud especially with the Motordrive, the F4 is not silent but sounds less metallic. MD12 especially made FM2/FE2 very loud.
Also never got an F5, I was disappointed by the new ergonomics. Took me five years (after 1988) to get a used F4, it did an extreme price leap compared to F3 and was too expensive for me to buy new
What I liked with the F2 and the Nikkormat is that they were able to take the AR-1 soft touch release - for me still the best way to release the shutter although not Giugiaro design.