
The enormous advantage with the D850 lies with its support of the super-fast XQD memory card format. On the face of it, it seems that the A7RIII is the faster camera, but the (huge) difference comes when you look at buffer clearing times, and how many shots you can actually take over the span of several minutes. The D850 is capable of a nearly-indistinguishable 9 fps but requires the addition of a $400 battery grip to do so.

It can rattle off 10 fps bursts, while the D850 seems relatively plodding, at "only" 7fps.

This may seem like an odd call, given that the Sony handily wins when it comes to out-of-the-box continuous-mode frame rate.
