Personally, i would go with the sony if faced with that sort of situation. My reasoning for that is this: the zeiss 24-70mm shows the least amount of barrel distortion at it's widest angle of the three standard zooms and is a really sharp lens to boot, which is great for your intended use of landscape work. Also, the high resolution of the sony a850 means that if you do go and print at really large print sizes, you do not have to sacrifice too much dpi. Also, the sony a33 will probably be the most useful video camera to me, as it provides AF in movie mode and offers plenty of video controls and compression formats. To me, this means that its much more noob friendly video-wise since I'm not much of a video person
with that being said, my heart goes out to the k-5 setup, despite my brain saying otherwise. good luck with your decision!