Sony a6400 vs the competition
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Sony a6400 vs the competition

Of course, the a6400 faces competition from outside the Sony lineup. And, while this slideshow focuses on how the bodies stack up against one another, it's massively important to consider the lens availability for different systems.

Don't be swayed by promises of X number of lenses, or cross-compatibility with full frame (the 'upgrade path' might lead to manufacturer profit more directly than to the place where all your photographic problems are solved). Instead check whether the lenses you think you might want exist, for a price you're willing to pay. After all, there's little solace in knowing there's a choice of manual focus 12mm primes if you primarily shoot portraits.

That said, it's hard to think of a camera that promises the all-round capability of the a6400 in terms of image quality, autofocus and video quality. Not because the Sony's performance is the best possible - its 4K is pretty wobbly, thanks to significant rolling shutter - but because any cameras that outdo it in any regard are all significantly more expensive.