I am quite curious to see how a non-IS standard zoom lens costing $2,300 performs. 70-200 IS II is one of the few zoom lenses that is sharper than primes (or as sharp as) wide open. I wonder if 24-70 II will achieve the same for say 24L, 35L, and 50L.
I say primes are always better for anything. If i used the 24-70 to shoot weddings in dimmed light i would get much more noise than at 1.2 or 1.4 with primes. If you compare mtf charts look at the f/8 results to compare.
I use TS-E 24mm 3.5 II, 35mm 1.4, 50mm 1.2, 85mm 1.2 II, 135mm 2.0 ,so i won't be buying any zoom lenses anytime soon on those focal lenghts.