Just a guess really, but with all those blades and the turning both ways on each wing thing, the noise it'll make is certainly going to be different. We'll have to wait until Marshalls get the test bed Herc flying (poor old Snoopy) to have a real idea of what it'll sound like.
Oh and by the way I live on the edge of Salisbury plain and by comparison the airspace around Weston is dead - I'd be complaining about the closeness of the M40
.