@blondie1: when the m8 came out at first I was also wondering about the philosophy at Leica. Producing a camera that is famous for its available light ability, being only useful at Iso 640 seemed very strange to me.
But now I understand that their first goal is to fully exploit the power of their lenses. And that is only possible with a ccd sensor.
So you kinda have to compare the Leica to medium format backs and their high iso perfomance.
I have made my peace with their Philosophy and I think if you shoot a 50 summilux asph. wide open at 1/15 you can use iso1250 and shoot in very dark places. The results are propably comparable to a dslr shot at 2.8, 1/50 at iso 12500.
The good thing is that Leica will have a very good sensor somteimes in the future, but I doubt that canon and Nikon will ever have lenses outperforming Leica glass.
So I think Leica might become interesting for professional Photographers again, in the next few years.
Regards Fabian