DPreview in testing was estimating that the sensor read rate of the Z9 was ~1/270th second (seems odd, but that is what he said). For the R3, it was ~1/180th. And, Nikon dropped the mechanical shutter entirely. So, in their flagship, they seem to seen reading a sensor in ~1/270th of a second is fast enough. Canon did come out with a video recently where Rudy Winston said the R3 was designed to be primarily electronic shutter.

I wonder if we are going to see a global shutter. I've been thinking this, and I wonder how much a global shutter is more of a concept and less of a reality. Ultimately, pulling information from millions of pixels instantaneously is a challenge, but then they have to be managed, kept in order, and recorded as a single image. To do it, you'd almost have to have RAM like memory associated with each pixel that could keep up with 20-30 fps. I am sure possible, but if it was easy, I think we would have seen it in the R3/Z9. Instead, we see faster and faster rolling shutters. Nikon seems to think 1/270th of a second is fast enough a mechanical shutter isn't even needed. I wonder if it is less expensive to get to say 1/500th of a second with rolling shutter read speeds and we never see a global shutter in this level of camera.

Back to the Z9, I mostly watched DPReview's preview in its entirety, but looks like limited buffer 40 frames at 20 FPS for full RAW, or 2 seconds. They have faster fps and larger buffers, but at increasing levels of image compression. It is also heavy like a 1Dx and Dx body. No weight savings.

Its funny, as I am seeing a lot of comparisons to the R3, but I have to admit I very much prefer the R5's buffer depth. Anyways, at this level any more, shades of excellence.