I find it hard to believe that 5 years on there is no equivalent replacement for my APS sensor based Sony DSC-R1. Ok it is not a constant f2.8 but f2.8 to f4.8, its EVF viewfinder lacks a few pixels, and it is quite weighty, but its lens is magnifique (IMHO). Surely there is something out there that can give me the equivalent functionality in a smaller, lighter package (and I do want a constant f2.8 or better!)