There are many opinions on this, but my view is that like many Superzoom
cameras similar to the FZ38/35, you are basically looking at a pretty expensive
Leica lens on a pretty standard CCD sensor
The FZ35 lens extends a fair amount, and if you are doing any macro
work, the risk of scratching the lens is always there. Simply put, if you so
much as even give your Leics lens a small scratch, you may well be
throwing the camera away! Why chance it? It's the main reason so many
professional photographers use them - Its about protecting the lens... not
about using UV filtering. (I use the same Kenko as in your post).
Also, if anyone tries to convince you that a UV filter will reduce the image
quality, take a look at Ken Rockwell's well known site, he has posted lots of detail about this too.