Firstly, apparently these two lenses are getting replaced in January. What's so bad about the current 35L? Does it perform ok at f1.4? Would it be advisable to wait till Jan to see what Canon bring out? If anything?
I currently have the Sigma 24-70mm f2.8 HSM. I use to love it but find on actual real world shots the colour accuracucy is completely ruined shooting with any sign of sunlight going into the lens.
I've been spoiled by primes, will upgrading to a 24-70L be limited compared to a prime or is it still good.