While the Canon EOS 5D Mark IV may look underwhelmingly familiar to the model in supersedes at first sight, don't be fooled – the engineers at Canon haven't stood still.
Compared to the EOS 5D Mark III, pretty much every element has been tweaked and improved upon. The full-frame 30.4MP sensor might not quite grab the headlines like those of some rivals, but it's still a welcome boost in resolution compared to the 22.3MP of the EOS 5D Mark III, while the improved noise and dynamic range performance make it an even more tempting proposition for those users thinking of upgrading.
And if you do upgrade, you'll get a camera that you can feel instantly at home with, while enjoying a number of improvements – the AF system is better for starters, with the Dual Pixel AF in Live View a huge leap forward. The touchscreen functionality improves handling considerably, while performance is also that much better.
It's certainly no surprise to see DCI 4K video capture, although the 1.64x crop of the sensor does make it hard to get those wide-angle shots; and while there is support for clean HDMI out at 1080p, it's not supported for 4K.
Those video irritations aside, the only other major stumbling block is the fairly hefty price, especially in the UK. However, if you can justify the outlay, then the Canon EOS 5D Mark IV has to be one of the most well-rounded and complete DSLRs we've seen. Suited to a range of subjects, from landscapes to sports and wildlife, it'll perform superbly in any situation.
Canon EOS 5DS
With 50.6 million effective pixels, image quality from the 5DS is simply superb, with fantastic detail, well-controlled noise and good dynamic range. The 5DS is now the benchmark for full-frame image quality, but it might not be quite as well-rounded a DSLR as the 5D Mark IV.
Read the full review: Canon EOS 5DS
The Nikon D810 is starting to show its age, but it's still a great DSLR. The 36.3MP sensor delivers stunning images, and set the benchmark for image quality for a long time. The 51-point AF system is also very good, and a match for the Canon's 61-point system, but the burst rate of 5fps might be a bit pedestrian for some.
Read the full review: Nikon D810
The A7R II has proved popular thanks to its 42.2MP resolution, generating huge images that have bags of detail, with noise well controlled. What's more, it can also shoot high-quality 4K footage, and there are lots of professional-level video features to play with. Lens choice is limited, but decent adapters are available for your Canon glass.
Read the full review: Sony Alpha A7R II