Thank goodness that i don't sell and re-buy gear, i only sell when i know 100% i don't use it, i don't sell even if i am sure %95 i will not use, because i know i may buy it or use it again when i needed, so that i will not sell my 1Ds3 because i have 1DX and A7r, i know that 1Ds3 can be a backup camera for both main cameras if one is stopped working or was sent for service, and for landscape i prefer 1Ds3 over my 1DX, but A7r became my main camera unless i have issues to keep me using only Canon.
Anyway, is 5D3 and/or 6D worthy now for me as long i have 1DX and 1Ds3 and A7r?
According to your gear list you have the budget to buy anything, so why not add a 6D?
A bit better ISO than the 5DM3 and it has the wifi function.
You don't really need the AF of the 5DM3 because of your 1DX.










