At the CameraSize.com, e.g.:-
http://camerasize.com/compare/#146,190
It can be seen in the above comparison that the Pentax Q is close in size to a W90, but *without* the lens! :-o (The sensor size is the same, though.) Btw, the database is being built-up and accumulated for more models. And there are only 3 Pentax models listed so far. Yet, I do find that this website is useful and it comes in handy when the sizes of cameras are needed to be compared, and also for the weight too. Nice concept and good works! The web interface is easy to use and fast to load, too. Keep it up, guys! :-)