Thanks useful information: 
Thanks NGP, now to challenge to you now youve stuck your foot in the door is to get your hands on the lens and do a benchmark for us all and tell us what you think.
Im not interested so much in cf to the Canon L series lens because 2000.00 + is too much for a lens in my amateur world.. for that money Id go buy a better body.
What I would be interested in knowing is that this lens IS going to give me better longer focal length images than said kit 75-300MM lens and that it compares favourably with its predecessors around the same focal length range in the Sigma stable particularly.
That kind of information would be very helpful.and I know you will have an infomed opinion on that.
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