no idea about the panasonic
buy the sony if
1) you need the headphones to be silent- the philips being open back leaks sound like anything - not suited for the office
2) you like bass. Nothing else you can get for <2k can give as much bass as these babies can. I used to think they were a bit over the top, but love them now
buy the philips if you
want clarity the most - the detail and sound quality is better