The official announcement of the A77 is due this week. This is a camera that significantly outperforms the current video DSLR top guns Canon 7D and GH2 in every department. If you are going to shift systems your Canon or GH2 compatible lenses (and even Nikon) will be paperweights on the Alpha because of the long flange distance of the mount. Also Sony’s lens range isn’t exactly huge and third…