This article shares some 1200mm EFOV test images that were captured handheld at Bird Kingdom in Niagara Falls Canada. In an earlier article, Jigsaws or Drills, we discussed that prime lenses and zoom lenses are different types of tools.
Neither type is ‘better’ than the other, but simply more suited to specific photographic approaches. My preference has always been to own and use predominantly zoom lenses as they better suit my shooting style.