For me, the key issue is how the camera handles. What I love about the E-1 and hate about the E-500 is the wealth of simple, positive and fairly ntuitive controls on the one, and their replacement by cheaper multi-funtion ones and multi-layered menus on the latter.
I'd prefer to stay with Olympus, and would like the tilt LCD, but the return of a manual aperture ring and a separate speed dial is a powerful argument for the Panasonic. A key question is the speed and effectiveness of the focusing, an area in which Oly has lagged badly, and also of the image processing, an ara which could also stand improvement.
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erichK
saskatoon, canada