I can tell you even though I have now owned the 24-70 II for a while (2 months?) I am still surprised on how this lens renders images. It really is like having an army of f/2.8 prime lenses built into one lens. Sure, you may not get the nice f/2 or f/1.4, but the versatility is well worth the price of admission for such excellent IQ and build quality. I shoot with it wide open about 95% of the time and am amazed at the detail at 100%. Very much prime-like, no doubt. If you stop the lens down to f/4 or f/5.6 it honestly does not get any better for landscape stuff. It beat the 35L at f/5.6, for example. So sharp edge to edge...
Canon is proving people wrong that zooms can never be the level of primes sharpness wise... With the 70-200 II and now the 24-70 II. Again, you don't get the nice f/1.4 or whatnot, but that is why it is great to have both if you can afford it.
Was it worth the $2300 to me? Hard to say... I am VERY happy with the lens, no doubt... It was a lot of money, sure... But I am completely happy with the performance and feel good about my purchase. I guess that is all that matters! 

