Sony updates its very popular RX100 MKII with a new third version. The camera is already being heralded as the best-ever compact or point-and-shoot. But at $800, it’s also the most expensive. The new model touts a cool pop-up electronic viewfinder (EVF) in lieu of a hot shoe, and an excellent new lens that mimics a fast (f/1.8-2.8) mid-rage 24-70mm (full-frame equivalent) zoom. The image quality is great, but at that price, Frederick Van Johnson and I ask, “Who’s this for?”