I seriously like the extra reach of the 35mm, which translates into the subject being nearly twice as large in the frame over 70mm...
Same here... I was thinking a let whether to get the (old) 24-70/2,8 or the 24-105/4. I did not buy a new one and the prize tag on the used marked was pretty much the same these days (+/-50€).
There were 3 reasons for the 24-105
1) smaller (ok, the 24-70/4 will be even smaller a bit)
2) IS (ok, the new one will have that one, too)
3) the range
I am using the lens on both - 7D and 5D2 - I definitly would not want to miss the extra 35mm - no way going back to a shorter lens. And for sure I will not run around with the bulky 70-200 in order to get the extra 35mm. Whith this lens I do like 80% of my shots. And ven if I took a 70-200 with me - I love the little overlapping... this means that you don't need to switch lenses more often than necessary. I learned this when I used the combination 7D + 10-22 + 24-105. I got mad, having the switch like every 5 minutes when I was on holiday...
With some overlapping focal range I probably would have saved like 50% of lens swaps...