The Nex-6 may have lower resolution than newer e-mount cameras, but its early version of on-sensor PDAF means that it's a large step up in AF performance from earlier e-mount cameras. This is still a solid camera, with lots of nice features. It is one of the last cameras to have the old menu system, which some dislike; it does, however have alternative "quick" menu options and more buttons than the Nex-5, adding to the usability.
