The K-x is definitely not quiet, I'd say probably as loud as *ist DS, which can wake up a small neighborhood late at night.
The K20D sounds a little different and softer. I've heard (ha!) that K-7 is quite quiet but I myself have never shot with it. I did shoot with a friend's D300 a couple of times and while it is not quiet either, the Nikon does have a distinct film SLR-like sound, if that makes any sense.
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