Yes, and the Pa3X costs more because it uses better components (digital/analog converters, filters, effect section, etc) and of course this reflects on the price.
I wish that a manufacturer could make the miracle happen, and come out with a keyboard that combines top sound quality, reasonable price and maybe low weight, but so far this kind of miracle -as far as I know- has happened only for the digital pianos, with the Casio PA5-XS.
We all have our priorities: it's only a matter of knowing what they are.