In September Sigma announced two brand new gigantic lenses.
The Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary and Sigma 150-600mm f/5-6.3 DG OS HSM Sport.
If you want to shoot outdoor sports or wildlife a huge telephoto lens like this is a must. These lenses are huge and heavy but they may be light on your wallet.
Image Source: Jonathan Nightingale