Portraits
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Portraits

Our choice: Sony a7 III

Anyone arriving from DSLRs is likely to be impressed by any of these cameras for portrait shooting. They can all focus precisely, even when using off-center AF points with a level of consistency that DSLRs can't match, and will do so even if you choose to shoot with shallow depth-of-field.

The Sony is the easiest of the three to shoot portraits with. Eye-detection AF has existed for a while but Sony's push-button implementation is hugely impressive for its ability to identify and tenaciously follow your subjects' eyes. Canon's Pupil Detection isn't quite as dogged and only works for single AF acquisition, requiring that your subject stays much more still. It'll happily focus the 50mm F1.2 wide-open, though, so it does its job.

All three cameras focus precisely, even when using off-center AF points in a way that DSLRs can't match

The Nikon is weakest in this regard. Its Face Detection doesn't focus specifically on eyes, so can leave focus mis-placed when working at wide apertures. Its small AF point is effective in some situations but the smaller 'Pinpoint AF' system is contrast-detect only, which can be too slow, both to position and to focus, so you'll need much more patient subjects.

The Sony has the fastest flash sync speed, at 1/250th second but modern high-speed sync and the other cameras' compatibility with their respective radio-frequency flash triggers may outweigh this small, 1/3EV advantage.

Historically Canon's JPEG skintones have been widely admired (though the other two brands are closing this attractiveness gap). This may make no difference to you at all, though, if you have a well-honed Raw workflow.

The slightly smaller size of a Sony a7 III with something like the 85mm F1.8 might make it a touch less intimidating than the other, larger cameras, but it's really the Eye-AF that makes the Sony stand out from the crowd for portraiture.