need opinion from anyone who switched from 1DS3 to 1DX

Have read this post am I am in the same boat, different direction...Looking to get a good landscape camera and I am torn between 1DX and 1Ds MKIII. Don't need the 15FPS and video of the 1DX but is the newest model...on the other hand, the 1Ds has 21MP and better color rendition. Shooting mostly landscapes and architecture for personal hobby and web posting. Please do NOT push 5D, 6D, 7D models, don't like child size cameras, looking for 1D model only (grown-up size).
Hard to find a new in store 1Ds MKIII and Ebay is full of abused ones sold as "great". Your oppinion please?