This report is based on a pre-production model. The GH3 is Panasonic’s most far-reaching attempt yet to take on Canon’s DSLR-market domination. So popular were Canon’s DSLRs for video that they were able to found the entire Cinema EOS business on the back off it (and in doing so, arguably they turned their back on the enthusiast DSLR video market). But there was always a dark horse and that camera…