Sony RX100 III vs. Sony RX100 II

The recently announced Sony Cyber-shot RX100 III looks set to be one of the best compact cameras on the market with its fast zoom lens, built-in EVF and large sensor. But how does it stack up against Sony's previous offering, the RX100 II? And if you already own that one, is it a worthy upgrade? We take a look at the specs and features of both cameras to see how they compare...