This kindof sucks. I bought my 1D Mark II refurbished in 2005, it's been my backup since 2010 and I still have it, works great. Bought a used 1D Mark III in 2010 which is why my Mark II became a backup. So, I've been using the 1D series for nearly 8 years. Here is my dilemma.
The guy who sold me the Mark III will be selling his Mark IV but it would probably cost me as much as a new or slightly used 5D Mark III which doesn't have the 1D build, but does have cleaner high ISO, which is why I really want to upgrade anyhow. The 1DX I can't justify the expense of it, and I'd be worried about being able to get used to the 5D Mark III after years of the 1D's. Though it is looking like the logical option. Going from that to my 1D Mark III which would be my backup would have different interfaces and may be tough to go between the two. Anyone experience that transition between the 1D bodies and the 5D Mark III?