Awhile back I got a used G5X and fell in love with the compact size. As I always do, I scour ebay for used equipment and found a deal on a G1X Mark III. The 2 main differences are the G5X has a 1″ sensor and 24 – 100mm f1.8 – 2.8 lens, while the G1X Mark III has a APS C sensor and has a 24 – 72mm f2.5 – 5.6 lens. Both have the much needed hotshoe for strobes.