Phil,
I've never been disappointed with /any/ of the Canon gear that I have bought or owned. I don't think this baby is going to disappoint, either.
I take my gear for what it is; a tool designed to do a job. Ilike having the latest and greatest, though. Will it make me abetter photographer? I doubt it. Will it allow me to make better photographs? Possibly. Will ISO-6400 or ISO-25,600 allow me to get shots that I previously would not have dreamed of taking, even if I end up converting them to black and white? You bet!
DPP now has a state of the art Digital Lens Optimizer module, too, by the way.
H