Modern smartphones have all but killed the inexpensive pocket camera market. It's not a surprise—for casual snapshots, there are few more convenient tools than your phone, and the results are more than adequate for most folks. But there are still people out there who prefer to use a dedicated camera. You might want some zoom capability, or simply find it more comfortable to work wih physical controls. If that's you, you'll want to think about a model that outpaces your phone in image quality. The RX100 Concept The original Sony Cyber-shot DSC-RX100—we're just going to call it the RX100 from here on out—debuted in 2012. It was an iteration on an existing concept—an expensive point-and-shoot with features to match. If you're summing it up in a few words, they're obvious: big sensor, bright lens. The 1-inch sensor format, now used by many camera makers, is about four times the size of the imager behind your smartphone lens, and more than twice the size of the 1/1.7-inch design tha...