The bulk of your research seems to be directed towards the body. IMO the current body should equal maybe 25% of your research. Choosing a system should really represent the difference. The body is often obsolete by the time you've saved up for it.
How many lenses are available (new and on the used market)?
What is the range of the lenses? Can you go 500mm if you want to? Macro? Tilt shift for your landscapes?
How do these lenses hold their value?
How quickly can you get rid of them?
Does the system you are eye balling have a comprehensive flashing system?
When sports pro's started moving to Nikon because of Canon autofocus issue's they were able to dump their sack full of lenses on the market, get good value on them, and sell them quickly.
When 3rd party lens makers like Sigma introduce a new 70-200 2.8 what mounts do you think are issued first?.... Canon, Nikon... then wait a while... Pentax... then wait more and maybe Olympus....
When 3rd party software developers release software and/or updates I can guarantee you the Olympus Raw developer will not be included until a later patch is out..
Want a Stofen flash diffuser for your flash head? Your local camera shop will most likely be stocking the Canon and Nikon.... but back of the bus on the order list if you want one for Olympus. Frustrating if you shoot on a daily or frequent basis.
This is why (to answer your original question) many pro's/amateurs stick with Canon and Nikon.
You can make great images with any of the systems (as Tirediron mentioned). IMO it's more about each systems strengths and weaknesses and how they suit up to your style and needs.
Bookmarks