The new pads is firmer. Which for some people (includes me) provide better comfort since it prevent the ears to be in contact with the housing.
Mine's broken for sometime and yesterday borrowed shure's SRH840 pads. Works like a charm, a bit warmer not by much, but provide better isolation and amazing comfort. Tried to wear them for around 6 hours straight yesterday. not up to fostex' comfort level but a major improvement.