Why is the Z50 image sharper than the Z5?

Edit: image in comments. I thought I attached it to the original post but I guess not.

I used the DPreview image comparison tool. I know the Z50 is noisier because it's a half frame compared to full frame, but it seems to be way sharper too? Look at the white spots on the leaves, the leaf outlines, and that yellow flower-looking thing on the right. Way more detail on the Z50 than the Z5. The Z5 is a full frame camera with more megapixels, so why isn't the image as sharp? I'm new to all the technicalities of cameras so I'm sure I'm missing something but I have no idea what.

And in general, is it better to choose a camera that produces sharper images with more noise, or less noise with less sharpness/detail? Which one is easier to fix?