I initially bought the 35L based from all the rave reviews. However, not enoughly consistent sharpness wide open and extreme CA turned me away from keeping it. The only reason I stayed away from 24Lii was the FL. I thought it would be too wide as my main walkaround lens. Boy, was I wrong...
This lens is far more superior than the 35L. I'm consistently hitting the sharp focus dead on wide open, and CA is very minimal. There are still some vignette and very minimal distortion, but none to be mentioned as a negative aspect.
I used to own 24-70L, 50 1.4, and 85 1.8, but replaced all these with 24Lii, 85Lii, and 135L. If you're in the market for either 35L or 24L, please do yourself a favor and try both before purchasing. Don't just buy a lens based on rave reviews. I tried both and highly recommend the 24Lii.