Overall, it makes no difference. Real world or studio photography is of a subject that is unique in time and intent, has no bearing on what other cameras do, and if it takes pixel peeping and side by side comparisons, there is no real world difference because the next shot might favor the other camera. The image quality is a non-issue, it is plenty good to satisfy any application and any viewing medium.
When I see such comparisons it tells me there is not enough attention to the problem spending a bunch of money is supposed to solve. The current camera, if purchased any time in the last 7 years or so, exceeds the DR and IQ quality requirements of any image printed moderate in since or for any current display size. An image viewed as the indented scale and distance from any of these cameras is superior to the display or printer DR and resolution.
There are lots of reasons to change cameras but looking for minute differences in IQ just does not hold much promise of change in what one has now.
What makes an image compelling or even desirable has little to do with these tests and pixel peeping. Photos that mean something are meaningful for reasons that a camera spec has no bearing on..
Admit that the reason to buy a camera is to buy a camera, not for meaningful improvement in audience response. Buying new toy is fun, and harmless provides all other more important needs are covered. That temporary high from a new purchases is a good enough reason, and more logical than an expectation of improved images.
Anything that jazzes you enough to try new subjects or techniques, or work harder to get to subjects, or motivates to take a lot more images are good things but a new bag or a len could do the same and cost a lot less. If one's bag is full of great primes and devoid of slow zooms and lighting accessories are solid, changing bodies is harmless. When I see a focus on camera spec but the camera bag has a poor supporting cast, like a slow zoom, I wonder what expectation are going to be met.
If buying a new camera is broken down to its constituent parts, emotions must be placed at the top of the list. To that end, forget specs and pixel peeping, just rent both and feel, touch, operate both in various conditions and one will say in loud exclamations "BUY ME". That is probably the best match to the most important reason to buy a camera; emotions. Holding a fine camera is its own reward. Rent them for a weekend and one will feel right. But only if the rest of the bag is up to the challenge of a higher res camera.None of the slow popular zooms are able to resolved much more than 10-12mpx, even some top primes on Dx fall flat about 16-20mpx. There are very few lenses up to challenge the resolving power of a 36mpx D810, let along a 42-46mpx D850. Resolution is over emphasised in photography and it makes a lot less difference than assumed, because very good images are being taken now with lenses that are crippling the 24-46mpx sensors. Micro-contrast is more important for the impression of resolution than resolving power.
To properly evaluate what specs are important, look at your best prints or screen images and detail exactly how a camera held you back or what camera spec would have resolved that problem. I will wage a bet I am not able to afford to lose that the real world problems with a specific image is not due the camera. Please post images that would have been better with a new camera.