Other than this should be in a lens thread. I like my 24 and 50 arts for the times I need the low light, the 16-35 is the most common on my camera.
My shooting breaks out into
1. wide & outside
2. long & outside
3. wide & inside
4. long & inside.
for long inside, I go with the 70-200 2.8. I can see the idea of the 24-70 basically replacing the 24 & 50 - I think I like my star pics w/ faster glass for shutter speed considerations.