For me, also with a 5DMk2, it's:


17-40 f/4 L


24-105 f/4 L IS The camera has this lens on it most of the time. I agree that it is the most versatile lens when walking around.


70-200 f/4 L IS (I have the 2.8, but for most shots during the day, the slower zoom is fine, and the images are slightly sharper).


I also carry a 40D and for this reason, I include this lens: 100-400 L. This stays on the 40D for the most part, since it gives me a 640 mm reach on wildlife, etc. I throw in the 1.4 converter, just in case


That becomes 17-900 mm. This covers the entire range for me. A tripod is a necessity, and can help mitigate the need for faster lenses on certain shots, so this comes with me (collapsible so it's easy to carry).