Almost all my lenses are prime lens 14mm 2.8 II, 50mm 1.2, 85mm 1.2 II, 100mm 2.8 IS, 135mm f/2 and just bought a 70-200 2.8mm IS II and this thing is heavy. That is one reason why I want a light weight zoom lens.
I need to find a walk arround lens for my (coming up) caribbean trips. Mostly outdoor, so f/4 should be good enough? I think. 24-70mm 2.8 II is my second choice, but gosh $2500... the first generation 24-70mm 2.8 is like 970g, almost double the weight of the 24-70 f/4 and has no IS. $1650 should be reasonable.