>The canon version is old technology.
So is Leica
>I Own a 24-70 III which is Perfect
You do? I guess this was a typo, wasn't it?
For my taste the 24-105 IS is too big for daily use... I often used the 24-85 3.5-4.5 USM, which nearly no one seems to remember anymore. The size and weight is stunning and the results are, let me say, good for the fast capture. With DXO-afterprocess the results are really quite good. So, the only thing I *MISS* is the weatherproof and maybe the IS, but the IS is just a feature for me.
The point is that recent SIGMA lensen, with quite a fantastic IQ, are lacking the weathersealed features... this is a shame. Maybe this sounds like a small missing feature, but in fact THIS IS SOMETHING I need on the Street. NOT just for rain, for dust too. I really hope the 24-105 will be sealed.