Decisions, decisions... new camera.....?
Sensor performance is not the Nirvana as some people looks understand.
All modern cameras has very decent sensor performance - certainly they are not equal, but for the same sensor pixel density the performance is close. It means the bigger sensor will offer an edge in the image quality only if you need big print outs (above A3) or very severe cropping as bread and butter for your daily practice.
There is other factors at least at same level of importance, at last IMO and the ergonomics or the handling of the camera is one of them. It looks you are happy with LX family: I would stay on the family, just updating for a newer model. I think it will avoid frustrations.
O.Cristo - An Amateur Photographer
Opinions of men are almost as various as their faces - so many men so many minds. B. Franklin