You may want to bear in mind that for landscape use, the resolution of the S3/S5 is limited by its 6mp + 6mp sensor. If you are OK with 6-8mp output, the S5 is great. If you need higher resolution (for cropping, etc), look elsewhere.
I'm kinda surprised that some here prefer to use the S5 than the D300. I've used both and I prefer the D300 -- it gives up little to the S5 (ok, a little less DR), but you get a lot more in sheer resolution, per pixel sharpness (and without the jagged egdes), speed, AF fine tuning and auto CA correction. These are all very useful features to me.
As for colour, it is pretty subjective and there's no end to the debate. I find the S5 colours mostly very good but just a little too biased towards magenta (which could partly explain why the colour of the sky in photo above looks "wierd"). You can easily tone it down in the camera. Personally, I also find the D300 a little too yellow (maybe after getting used to the Fuji colours!) and I tune it a little bit towards the blue channel -- that's my own preference of course.