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Possibly they've improved. Most of the places I'm working in have Miele, we have a 20 year old one. The new Miele seem to need more maintenance but it's possible they are just overloaded more often. The Miele engineers are not recommending changing to a new one at the moment, that's based on the number of problems they are seeing caused by the lower energy use engineering.
The difference between 49db and 54db is roughly double the energy in the sound. 3db is a 100% increase in sound energy, that equates to about 25% louder subjectively. So not a small difference.