Sounds like we are in a similar position. I made the jump from a 7D to a 5D3 about six months ago. I had the Canon 17-55 and the Tokina 11-16 on the wide end. Obviously sold them, and used the 24-105 for a bit as a replacement. I found that I rarely used it after acquiring the 35L and the 85L. I love my 35L, but it isn't super wide, and I plan to get an ultra wide at some point. Thinking about the Tokina 16-28, Canon 24L or 14L, or wait to see if the rumors of a 14-24L are true. I have found that I prefer primes generally, so personally I wouldn't want the 24-105 at this point, even though I think it is better than my old 17-55. If you liked yours that much, it might be a good solution to sort of bridge the gap between two lenses.