Thank you for your reply.Hi @Notepad12 and welcome to TP.
You've already moved your goalposts significantly since your opening post, and I'm pleased that you've already realised you'll get a lot more bang for your buck in the S/H market.
In your shoes; I'd keep my powder dry for a while and head to the Photography show in Birmingham in a week or so. There you'll be able to see the different brands (and formats), have a play and compare the look and feel of the leading brands, don't fall for the marketing hype though.
Take cash for your lunch and leave your cards at home though - it's too easy to get tempted by shiny things.
Of the stuff you've looked at, the 5dIII is an absolute bargain atm, but that should also show you that DSLR's are the past and mirrorless is the future (that camera was £3k new). However, I don't see anything in your intended use that makes me think you should be thinking of FF. APSC and even M43 cameras are perfectly capable of capturing great images, and lighter on the shoulders and bank balance.
I've moved my goal posts yes, because there's simply so much range and many options to look into/at it becomes overwhelming.
The 5diii seems like a solid choice for sure.
Would you say the Canon EF 24-105mm f/4L IS II USM lens is a good all rounder? (Family pictures, not so far away wild life etc)
I'd be looking at the 100-400 for longer range wild life of course