There's no big center sharpness difference between 35L & 24-70 @f4, at f2.8 it's small. I'll shoot portraits & maybe events/weddings with the lens. Thus my question is: How often do you really use the f1.4 to f2.8 range on the 35L, or do you have it mainly for the stellar iq?
I use the f/1.4 to f/2.8 range most of the time I'm using the 35L, which is mostly used indoors. I switched from a cropy body to FF recently and sold my 17-55. I did not replace the 17-55 with a FF mid-range zoom, so now I'm using primes (35 and 50). Outside, I tend to use the 50 more often because there is more space and it gives a longer working distance.
I'm tempted to see how well the 24-70L II performs. With 35 and 50 primes, I gain low light capability that I won't have with the 24-70L II and the IQ should be similar, so I don't need a midrange zoom anymore.