I think the 8-15 fisheye is plenty sharp. One of my funnest lenses.
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I think to get the best AF response from the 5D MK3, you need to use the newest glass...
I sold all my L primes and the 16-35 F/2.8 II because the 24-70 F/2.8 II is better than all of them combined.
I particularly dislike both the 16-35 F/2.8 II and the 24-105 F/4 because they are not sharp enough for my taste.
The 24-70 F/2.8 II is another thing entirely.
I must have got a good copy because I got another copy of the Sigma 35mm F/1.4 and I think the Canon is sharper @ F/2.8.
The newer IS primes are all very good, very sharp and focus much better than old glass too.
They just have a 2 dimensional rendering that I don't care for.
I'm currently down to the 24-70 F/2.8 II, 70-200 F/2.8 II and Sigma 35mm F/1.4, which are arguably amongst the sharpest Canon lenses available. To be a prime lover and end up with mostly zooms is a shock to me, but the Canon primes are all old and need updating and in the normal range, the 24-70 is as good or better than everything available (and yes, I had a 24 F/1.4 II and immediately sold it when I got the 24-70).
My advice - save up and get the 24-70 F/2.8 II - it really is made for the 5D MK3, IDX and 6D
If you are happy with what you are doing u are a good photographer.
Next to that, the af assist on a €3000 camera should probably just work.
I had also bought this very same lens from Amazon, and had an issue with it < 1 year of having it. Since it was outside the return policy for Amazon, I sent it to Canon, and they got it back to me within 2 weeks. It has worked beautifully ever since. So even if for some reason Amazon won't help you, Canon will.