Possibly as good as you can do. Super zoom lenses are usually weakest optically at maximum zoom. And you have diffraction coming into play at f/8 where you get the deepest depth of field. If you have any camera movement you may adversely affect focus. I didn’t perceive any camera handling issues in your examples though. In some situations optical stabilization may impact acuity too. Higher quality lenses may have better coatings and better optical properties. If you have the lens hood make sure you use it as it may reduce flare from light sources outside the field of view.
Actually I've never used the lens hood, I don't really know why tbh, I need to experiment with that then.
Earlier in the summer I did buy a monopod which I have used a bit to try and help with stability but it's obviously useless for anything moving fast, not so bad when things are at rest.
All the photos above were hand held as there was so much going on, taking off, flying, resting etc.
The I.Zoom feature does a crop and then some processing magic. According to Panasonic’s documentation it’s better than digital zoom but still results in lower quality compared to having it off.
I need to bite the bullet a bit then I think and switch it off, I have got so used to that extra bit of zoom it creates.
Thanks once again for your comments.