The E-M1 Mark II is not only better than the original model in every way, it's better than most mirrorless in every way too. Principal to its success is the built-in image stabilisation - which is the best sensor-based system we've ever used - and its super-quick reactions across the board, from...
Very fast; Quick autofocus; Articulated touchscreen; Image stabilisation is unreal; Mechanical and electronic shutter shooting modes; Can be customised to the nth degree; Ever expanding lens choice; Sharp images at low to mid ISO settings
Image quality in low contrast light; Limited dynamic range in high contrast light; Silent shutter is so discreet that it's easy to forget what shooting mode you're in; It's an expensive purchase