Sony Ericsson

hi just wondering if anyone knows if sony has improved on the mic picking up backround noise. I love sony phones i had a 68, 616 and now a 637 but all of those phones had a tendancy to transmit everything that goes on around me. If there is someone standing in line even 4 or 5 ppl behind me talkin its as if he was talkin on my phone, atleast thats what it sounds like to people on the other end. I know motorola is really good with their mics and im wondering if sony started adding any noise filters into any of their newer phones like the z520a or the upcoming 600 phone? anyone know?