I purchased the XE2s and it is a great camera.
However I did not own a previous XE camera
I do not think the XT2s is meant to appeal to XT2 owners
Or even XPRO2 owners
It will be there for people who do not own these cameras and at the time of purchase require the latest modern gear
they will compare and contrast to other camera manufacturers
put yourself in the position of the camera salesman trying to flog off an old model
