Looks like FFG may still encounter problems with scaling in this game.
It's hard to tell from the pics, but I'd guess the Victory Class Star Destroyer looks to be around 8-10 cms long
-Using the same scale for other models, that would put the standard Imperial class SD in the region of 16-20cms and the Executor class SSD at close to 2 metres in length.
My guess is that FFG are simply not going to bother having the models to the same scale at all.
Well to be fair, to have a practical game, somthing in the scale department has to give. Also these appear to be just renders at this point, the actual models could be sized differently.