In reply to blue_sundown:
For landscape, a circular polariser is a good filter to have. I have a G1 X, with the adapter to fit the polariser: I wouldn't have bought the camera if I could not do this.
So I don't have the G16, but the adapter looks similar to what I have to use.
For 'point and shoot', the adapter and polariser is off. But for landscapes, which I generally take more time over, a polariser is a very useful addition for many shots.
You cannot really replicate the effects of one well in software.
That's my take on it anyway.