Looking to upgrade from my Canon 5dmk3 to either 5DMK4 or R5.

[Phil V]

Excuse the 220kb export but another thing is the focus... the very furthest objects in that shelf at the back of th room are not sharp, see zoomed in screen grab.... Was at F9 also.. Would I need to go much higher than this to get that? F16? Or would that start to have a reverse effect? You can also see what I mean by noise... Sure it may be pixel peeping but this is not high enough quality for me.

Canon 5dmk4, Canon 16-35f4 L, Rollei carbon tripod..

View attachment 383987

View attachment 383988
This scren grab is of one of the CR2 files, so not blended in PS, as some people may have thought it was due to the layers not being aligned, but it's just a CR2 file.

Focus is a plane - there's nothing you can do to stop that being true.

DoF is a range of 'acceptable' focus either side of the plane of focus. Acceptable is a purely subjective term.

The only way to get everything in that image 'in focus' would be to focus stack a large number of images.

But - and again this is my completely subjective opinion; if you did that - the image would look completely unnatural, because human beings aren't used to seeing interiors completely front to back sharp.

BTW - if you get a 500 mpix medium or larger format sensor, those issues will increase rather than decrease.

And even if that jar was completely in focus, when viewed at 400% you'd still not be satisfied it was 'sharp'.

In short - your expectations are unrealistic and not based on photographic principles.