The main difference between the 350 and the 320 are as follows…
PMW-350 = 2/3″ chipset 59dB S/N
PMW -320 = 1/2″ chipset 54dB S/N
Now thats got to give Panasonic a kick in the pants not only do Sony bring out the 2/3″ 350 but they also bring out the 320 1/2″ shoulder mount as well…not a sign of 1/3″ chips in sight !
Sadly it does not come close to EX-3 prices but if you really need that full shoulder mount kudos then two thousand pounds is a lot closer than finding £6K for the 350 and by all accounts its still a lot quieter than the EX-3.