As a very new owner of a 5D mark II but having owned (or still do) an Eos3 and a 30D, I am amazed at the cheap and nasty row the 5D2 shutter makes. Its more than just noisy, it could be that but still have a "high quality" ness about it. No, this is just cheap and nasty sounding.
I've never read anyone else complaining of it which makes me wonder whether this is only an issue with my copy?
What do you other owners of this camera think about yours?
sound of the shutter. 

