Not a big fan of big lenses, very unwieldy and embarrassing to pull out in public plus they are usually pretty disappointing when it comes to sharpness. The Pentax 150-450 although living up to big and embarrassing seems to break the rule of unsharp. Nice. The K-1 is one excellent camera, I haven’t shot my Canon DSLR for a while but I can safely say that the K-1 is a better experience all round. Its a testement to Pentax that with the same sensor as the Nikon D810 the K-1 can out perform the Nikon- well done Pentax.