Noise is a very subjective thing. It has alot to do with frequency and vibration as well as the actual noise level.
However, I can say this... My 4 cylinder LX is almost silent at idle especially if I have my a/c turned off. I can hear a little and there is a little idle vibration, but neither is objectionable. As far as quietness is concerned, my standard is very high.
I did have noise issue with my LX - in which the problem was traced to a broken exhaust mount bracket and rubbing of transmission coolant line. It took 3 visits to the dealer and Honda corporate to track down the problem.
All I can suggest is perhaps do a test ride at a dealership and see how yours compare. If you still think yours is abnormal, have a service advisor ride with you.