The A7R5 has a maximum fps in mechanical shutter mode of only 10 fps - if that's good enough for you, that is fine. However, I would recommend when you go over to Sony that you go for the A1 - it's the one up there with the Z8 and R5 for high resolution action and birds in flight.Rolling shutter is non-issue for wildlife when using a mechanical shutter. If you're shooting baseballs coming off Ohtani's bat, you may have issues. If you need faster framerates and are using the electronic shutter to get there, different story of course.
As for me, I'm waiting for the Sigma 500/5.6 price to drop here in Japan. The initial price is about $2700+tax here, I expect it will drop to around $2300+tax by the end of the year. I'm not in a rush. I vastly prefer compact primes over zooms, to the point that I only own one zoom currently, a 100-400.
The Sigma 500/5.6 and the Nikon 600/6.3 both compare well against the $12k ~ $13k 600/4 lenses. You lose a stop of light but not the IQ. You can tell yourself what you wish about the 100-500 but there's no way it actually compares like that.
The Nikon Z 600mm f/6.3 has been extensively reviewed and compared with the 500mm f/5.6 PF lens https://photographylife.com/reviews/nikon-z-600mm-f-6-3-vr-s The 600mm is slightly less sharp in the centre, 3303 on IMATEST vs 3332. As I mentioned before, I have owned both and shot extensively with the Nikon 500mm PF and the RF 100-500mm at the same time and compared them carefully on the D850 and R5 with charts and in the field and posted the results on CR - see for example https://www.canonrumors.com/forum/t...vs-400mm-do-ii-on-r5.39813/page-3#post-921356 They are nearly indistinguishable wide open at 500mm. You haven't owned either, just a 100-400mm, so your comment "You can tell yourself what you wish..." is rather inappropriate as well as being a bit rich. DO/PF technology does have its pluses, but it does lose out a bit on IQ and is weaker against the light because of the zero-order diffraction.
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