Sony a6600 is the successor of the a6500, and has some new improvements. One particularly change is the new battery. Its battery life has more than doubled compared to its predecessor, which is quite a feat.
This camera exhibits many notable changes. For example, it boasts 0.02 sec AF speed instead of 0.05 AF speed on the a6500. It also supports 4K HDR movie recording, something that its predecessor lacks. It gets the lastest bionz X processor with a 1.8x processing speed improvement, a bigger grip for better ergonomics as well. It has no limits on continuous video recording time, while its predecessor has limits of 29 minutes.
Are there any drawbacks to this camera? Well, this camera lacks a headphone jack and its touchscreen doesn't work for menus and navigation. And its memory card slot is UHS-I compatible.