NEX-F3 frustration--is this related to ISO 200?

I see 2 main reasons:

1. Sun light is missing in NEX shot (as other guys mentioned)

2. NEX has MUCH bigger sensor size than FZ28 and because of that on same aperture you have much shallower depth of field and because of that most of your image is out of focus. I would suggest to try for such landscape shots aperture of f/8 or maybe even smaller. Yes - bigger sensor is not always better