I have owned (and still own some) many cameras of many brands : Olympus, Minolta, Nikon ...
Today, i almost always use two Nikon DSLRs : Nikon D100 and D200. These cameras seem to be done for fitting my hands, i love their ergonomics where the good thing is always under the good finger. AF is awesome and metering very acurate.
Today for a landscape photographer shooting raw, each camera brand can deliver some very nice files with enough quality to enable very large prints. So my choice is done on ergonomics, reliability and viewfinder. Some people shooting JPEG in low light with high ISO could have other criteria ...
