The SD1 (See
Sigma SD1 details here) is by far the best spec. Sigma DSLR, not just ever, but for its time. The basic spec. of all its predecessors was lacking in one area or another and build quality was generally unimpressive. I also haven't been wowed by image quality either. I remain open to be convinced, but until now the suggestion that the previous SD DSLRs were somehow better than comparable competition because of their Foveon sensors hasn't, in my experience, been proven. The SD1 certainly looks like changing that for the first time and I look forward to trying an SD1 in the future.
I'm a bit surprised that the viewfinder, for example, isn't 100% at this level. There is no video mode as far as I know, nor live view. But it does have some dust and moisture sealing and a magnesium alloy body, although only a small number of Sigma lenses are similarly equipped. Details on shooting rate and availability of accessories like battery grips, for example, are a bit sketchy.
But yes, a £6K+ price is astonishing and means the SD1 must persuade Canon EOS-1Ds and Nikon D3s users, let alone Sony Alpha 900 (less than half the price) users and EOS-5D Mark II users, that the price is somehow worth it.
Ian
PS One plus that does tend to answer the admittedly recurrent question mark over sample variability is that (in the UK at least) customer support us usually exemplary.