1dmk4 as all around camera

If I want to have just one camera for portraits, landscapes and wildlife, is the the 1dmk4 the best camera to buy assuming cost is not a consideration ( although I am not willing to spend the $'s for a 1ds mk3)? I know that there isn't one camera that can do it all, but would this come the closest for me, and do I compromise too much with the 1dmk4 when shooting landscapes and portraits? Also, I just traded in a 5d which was a dust magnet, and I could never get the sensor completely clean--I found this irritating and would like to replace the 5d with a camera that will pretty much eliminate this problem. Opinions.