Upgrades

[tatts]

I've finally decided to upgrade my 5Dc but can't decide what with. Torn between the 5D3 and 6D. Is the 6D AF a big enough step up over the 5Dc? The wifi and GPS would be useful on the 6D and the £1k saved but I might benefit more from the better AF on the 5D3? Would I benefit from hiring the two?

I'm also look for some new glass for landscapes. I was recommended the sigma 12 - 24 but i'm also looking at the canon 17-40mm F/4.0 L and 24-105mm F/4.0 L

 

[tatts]

I'd probably look at 17-40
kd

That's the one i was edging towards so that one it is then.
I want an all round camera really, I feel this is were the 5D is frustrating me. With a 50mm prime or my L lens upto 200mm it's great, anything over that and i'm getting a lot of noise and/or blur which i never had with my old 450D (I'm blaming the AF).
I nearly bought the 6D due to the price but using a 100-400mm for action shots i want a good AF really.