Sony developing a 400mm F2.8 G Master lens

The just-announced a7R III is pretty cool, but if you are a serious sports or wildlife shooter, the development announcement of a Sony 400mm F2.8 G Master lens is a way bigger deal. Not only does this lens receive the brand's top mark of quality, by being a part of the 'G Master' series, but it rounds out Sony's overall commitment to photographers, by providing a seriously long pro-level prime. It won't be available until Summer 2018, which is conveniently right before some sort of major worldwi...