Depends what time of day. The Pier is often quiet because it's a bit more out of the way than the other lounges, and the tea room and resting area at the back are usually pretty quiet in terms of noise and foot traffic. The left side of the Bridge (as you face the front desk) is a consistently quiet spot. I haven't been there but I suspect the Deck is probably quiet because it's still new. But the above posters are right, any part of the airport will be as quiet as it is ever going to get right now.