Camera Labs

http://www.lensrentals.com/blog/2012/09 ... tion-tests

It's expensive, but it might just be worth it! Lensrentals.com found it resolving better than the TS-E 24L II which was their best lens at 24mm up to then.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.

Impressive

Only thing which is a downgrade, in my opinion is

THE LENS-HOOD
Original 24-70 mark1 has a great, classic, good looking Hood, which suppose to cover from the wild angle to telephoto!( hope i am right)

Now its look awful ........

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Nikon D800
Nikon AFS 50mm F1.8 G
Sigma APO 70-200 F2.8 EX DG OS HSM
Sony H50

I saw those figures just before I visited this forum; impressive, indeed!

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Canon 7D/5D/40D/1D2N; Nikon F6, FM3A, & Coolpix A; Canon 40mm Pancake, 135L, 50L, 35L, pre-II 50mm 1.8, 100mm 2.8L Macro, 10-22mm EF-S, 28-135 EF, 400mm 5.6L; Nikkor 50mm 1.2 AI-S, 50mm 1.4G, 50mm 1.8D, 16mm 2.8D Fisheye, 180mm 2.8D, 100-300mm 5.6 AI-S; Tokina 17mm & 100mm 2.8 Macro