According to my rudimentary photogrammetrical analysis below, Sony has smashed its previous grip-depth record with the A7RIV: 23.6 mm!I believe this does have a deeper grip so that too would be an advantage for people with big hands. Me, the smaller the better, especially if I am going to pop a big lens on it.
This represents an increase of ~4.9 mm compared to the A7RIII and, unfortunately, it also makes the camera a non-starter for use with my various FrankenKameras, wherein I use my A7R as a poor-man's digital back, along with various adapted lenses, and mount it to my FrankenKameras via its lens mount. For example, here's my modified Cambo WDS outfit, which provides generous amounts of rise / fall / shift movements on its rear standard:
The trouble with this approach is that the greater the depth of the grip, the thicker the spacer that is required to provide sufficient clearance for the grip relative to the camera mount panel. And the as the thickness of the spacer increases, the minimum FFD of the lenses that can be used with it increases by a similar amount.
(For those who haven't been paying close attention to it, here's how the grip depth has (de)volved over the four generations of the A7R series: A7R - 8.8 mm; A7RII - 16.9 mm; A7RIII - 18.7 mm; A7RIV - 23.6 mm.)
Perhaps surprisingly, I use 35 mm format lenses most of the time -- you might be surprised how many of them project image circles large enough to provide a useful range of rise / fall / shift movements -- and the grip used on the A7RII was just beyond the limit my cameras could handle without significant additional modification. The A7RIII, with its even deeper grip still, can't be accommodated on my FrankenKameras using my lenses of choice (film-era Contax / Yashica lenses) and is basically limited to being used with medium-format lenses.
Worse, the one camera I own that is designed in such a way that it can accommodate the grip of the A7RIV -- a Cambo Actus -- will only just barely do so when used with my lenses of choice.
I just took some quick-and-dirty measurements from my Actus, which is presently setup to use my C/Y lenses, which have a FFD of 45.5 mm.
The A7RIV's deeper grip will easily clear the Actus' rotating camera mount bracket, but -- incredibly! -- it will also come within 3 mm of the outer edge of the back side of the lens panel.
This means it will push / fold the outer edge of the standard bellows around the outer edge of the lens panel and sandwich the bellows material between the lens panel and grip.
Not only is this likely to interfere with the rise / fall mechanism on the rear standard, but it will significantly limit the amount of tilt and swing that can be applied on the front standard as well.
Fortunately, Cambo does offer a single-pleat bellows for use with wide-angle lenses and this will at least partially address these issues by reducing the amount of bellows material that ends up being sandwiched between the Actus and A7RIV bodies compared to the three-pleat standard bellows.
And Yes, I realize Cambo didn't design the Actus to be used with 35 mm format bodies and 35 mm format lenses, but they do intend for it to be used with APS-C and m4/3 format bodies and 35 mm format lenses, and if this trend of increasing grip depth on mirrorless camera bodies continues, this may eventually become an issue with those bodies as well.
And I also realize that my particular combinations of needs and wants makes me very much outlier among the potential buyers of a Sony camera body, so I can't say any of this comes as a surprise to me. However, it sure would be nice if Sony recognized that not one form-factor works best for all photographers -- and especially not when the grip becomes larger and its depth becomes deeper every time they update it! -- and offer an alternative model that is flatter across the front. You know, like Fuji does across its camera range...
Needless to say, this is a long-winded rant pointing out that not everybody is pleased by Sony's decision to increase the size and depth of the grip on its A7R-series bodies with each succeeding generation. The fact that the A7RIV body is also 200g heavier than the original A7R (which represents an almost 50 percent increase ... oink, oink!) is not particularly welcome, either.
Mind you, I'm very happy with the performance of my A7R and although I would like to replace it someday, with the direction Sony appears to be headed, I fear that might never be possible.