I'm curious on people's opinion regarding weight.
At the moment in my bag I have the 6D, a sigma 50, the 24-105 and the 100-400L. Whilst none of these are massively heavy (ok the 100-400 needs a bit of getting used to), I've had no issue lugging it all around.... The thing is, I don't really need anything more than that. Even if I expanded my lens collection, I don't see why I'd need to take more than three lenses out unless I'm doing a wedding or massive shoot kind of thing (unlikely).
In the grand scheme of things is 1kg really going to make a huge difference to your overall setup?
kd