A lot of nice things will be done with this new Canon offering. Big introduction set of lenses, very interesting and practical AF system, adapters, you have already named more - nice! But for me, personally, the deal breaker would be smaller VF and, most important, absence of IBIS. Very few new Canon's lenses have IS, and millions of earlier lenses are abandoned. As for me, the Sony's and Nikon's (SIC!) offering looks more advanced, especially if there will be possibility to use old manual glass. LZ (BTW, Canon's front mount - 5 bolts!).