Hi I know this may be a little dated as sony no longer stocks these but I was just wondering what the difference was? I've exhausted all the search functions I could before coming here to ask and just wondered if there was anyone more in the know? I notice there is a X1000B which looks to have a slightly different frame but I cannot see a diffrerence in the the two aforementioned frames. Is there something I've overlooked?

Many thanks for any help!