Consider carrying a 15mm, a 24mm, a 40mm, a 80mm, a 135mm, a 200mm, etc. and compare that to carrying a 15mm, a 24-105mm and a 70-200mm. With L-series and digital lens optimization there's no drop in IQ.
Carrying the lenses is half the battle. Switching from one lens to another is a pain and you'll find yourself avoiding going to the best focal length because it'll require a lens change. Of course, you could do like me and carry two bodies and four lenses...
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