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Verdict
The Canon PowerShot G1 X Mark III is certainly a big improvement over the undercooked G1 X Mark II. The fact that Canon has managed to engineer a camera this size with a large APS-C sensor is very impressive – and even more impressive is the fact that this is the first APS-C format compact camera to feature a zoom lens, making it something quite unique.
The sticking point might be the asking price, especially when you compare this camera to DSLR or mirrorless rivals. However, if you're set on a premium all-in-one compact camera, the G1 X Mark III doesn't look that bad when you compare it to similarly priced rivals. The fabulous Fujifilm X100F costs more, but doesn't offer a zoom lens, while the slightly more affordable Sony RX100 V offers a longer zoom and snappier performance, but with a smaller 1-inch sensor.
All things considered, Canon may have hit the sweet spot for enthusiast photographers looking for a compact partner for their DSLR kit, or for those looking for a versatile and neat all-in-one solution that delivers DSLR-quality images.
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Competition
Sony Cyber-shot RX100 V
Sony's Cyber-shot RX100 V is one of our favorite premium compact cameras. The 1-inch sensor is smaller than the one found in the G1 X Mark III, but images are very good, while the more pocket-sized proportions certainly have their appeal. Add in 4K video capture, 24fps burst shooting and a great AF system, and the RX100 V is one very capable compact camera.
Read our in-depth Sony Cyber-shot RX100 V review
Canon PowerShot G5 X
The baby brother to the G1 X Mark III, the PowerShot G5 X features a 20MP 1-inch sensor similar to the RX100 V's, while handling is similar to the G1 X Mark III. Despite having a smaller sensor it's not actually that much smaller than the G1 X III, but having been available for a while now it's quite a bit more affordable.
Read our in-depth Canon PowerShot G5 X review
Fujifilm X100F
It may not have a zoom lens, but the X100F from Fujifilm shouldn't be ignored. This is a fabulous APS-C compact camera with bags of retro charm. It features a clever hybrid viewfinder, while the tactile body-mounted controls make it a joy to use. It's expensive, but it's a great compact camera for the enthusiast.
Read our in-depth Fujifilm X100F review
Phil Hall is an experienced writer and editor having worked on some of the largest photography magazines in the UK, and now edit the photography channel of TechRadar, the UK's biggest tech website and one of the largest in the world. He has also worked on numerous commercial projects, including working with manufacturers like Nikon and Fujifilm on bespoke printed and online camera guides, as well as writing technique blogs and copy for the John Lewis Technology guide.