Gosh - big changes Nasos
But judging by these 3 pics, your skills are also supported by the Z50II
Unless you've already posted it, I'd really like to hear your thoughts on the two bodies, esp for BIF.
Two things caught my eye:
- the small insect being chased by the swallow in the first pic
- the feathers on the belly of the third pic - almost like fish scales!
I've never noticed that before, but your clear, sharp focused & brilliantly captured image helps highlight this.
Colin you are spot on

Yes the small insect exists and the birds mouth is open ready to eat it, thats the reason to post this shoot

The feathers shows identical to a fish thats also surprised me
But another thing that you can see in the second photo is the symmetry that exists on the body and the feathers of the bird

These birds are in continuous motion, they never stop to fly and the main reason is feeding. They feed themselves with all that tiny insects they catch, but seen them doing that continuously for many hours I cannot understand how come this tiny piece of food is becoming so much energy to fly

Thats Nature!
To answer your question: in terms of AF the two cameras seems equal but Z8 is completely black out free and Z50ii has a slide show as when you shoot with a DSLR
When you shoot with electronic shutter there is no black out but the EVF freezes for milliseconds and if you shoot continuously you may miss the new position of the bird
But as you stated earlier if you adapt yourself with the changes you can do the job
Dont expect to see better image quality but if you fill the frame and use denoise software it can be close to FF
Its lighter, smaller, it can go anywhere without the fear to carry an expensive camera, dont have to pay the extra features, nor have to sell your car to buy it
I hope this helps, I already got beautiful pictures to post, stay tuned and thank you!