your shot is underexposed,Try the same indoors or under shade without cranking your iso enough for grains to show on a f4
My shot was done on low iso in the shade. I'm not too sure if it's achievable with a zoom lens at f4. It maybe possible, just harder
if you increase exposure at post, it will have more noise than shots taken at higher ISO, and also losing shadow details
just use high ISO and shoot with correct exposure, the noise it is so much easier to take care than underexposed images.