ffmpeg - image with zoom - looks low resolution
zoompan, by default, scales output to 1280x720 (and at 25 fps). 

Use

ffmpeg -loop 1 -f image2 -i 'IMG_8444_edit.jpg' -vf "zoompan=z='zoom+0.001:s=WxH,scale=hd1080" -c:v libx264 -preset fast -t 5 -crf 22 -y 'zoomout.mp4'


where WxH is your required output resolution from the filter.