I have the 14LII, sig 35 f1.4.... wow, yum, whoopee!
if you want aperture-speed and lowest distortion...they are wonderful
I kept the 16-35 II because it is also great
has more distortion but less chromatics than 14L II
sigma is a class in itself...fagetaboutit Canon
the 16-35 II really is the best, most versatile range to get that ultrawide bit included
look for a deal on a new one and add it...
if you want the next level of quality from...14-24 or what ever ...maybe...canon brings ...someday...
I believe you would do better from the two primes....
get the 16-35 II....I cant let mine go....
16-35 II and a 100 macro-L in a little side-case..
and I can tackle a whole city....crushing museums, bridges, tall buildings and people on the street...
just like Godzilla
you will likely get most of your money back because others also know this
Just my ideas