Big and heavy??
The 24-70mm II is 20% lighter than the version one. Ver 1 is like 950g, and if I remembered correctly, the v2 is around 805g or so..........
70-200mm F2.8 - 1310g
70-200mm F2.8 IS II -1490g
70-200mm F4 - 705g
70-200mm F4 IS - 760g
Canon Camera Museum | Camera Hall - EF Mount
In fact.... I think for the F4, the IS and non-IS is only 55g, and for the F2.8, the weight differences is like 180g...........
It is not big difference for me............... marginal.............
dude, the version 2 doesn't have IS, I'm saying that a 24-70 with IS will be very heavy
Canon EF 24-70mm f2.8L II USM: Digital Photography Review