There's no peace of mind, just because you paid for it. I can sell you the rights to a photo I don't own, and the original copyright holder can go after you for infringement.
IANAL but I'm pretty sure Getty is guaranteeing you won't get sued
From their license
> Warranty of Non-Infringement. For all licensed content (excluding content marked “access only”), Getty Images warrants that your use of such content in accordance with this agreement and in the form delivered by Getty Images (that is, excluding any modifications, overlays or re-focusing done by you) will not infringe on any copyrights or moral rights of the content owner/creator.
Note, I have many photos CC-BY on Flickr. One company wanted to use an image I took in the Louvre and wanted me to sign a different license. I refused as their license required I indemnify them and I had no idea what the legality of that image is given it was taken inside the Louvre
From their license
> Warranty of Non-Infringement. For all licensed content (excluding content marked “access only”), Getty Images warrants that your use of such content in accordance with this agreement and in the form delivered by Getty Images (that is, excluding any modifications, overlays or re-focusing done by you) will not infringe on any copyrights or moral rights of the content owner/creator.
https://www.gettyimages.com/eula
Note, I have many photos CC-BY on Flickr. One company wanted to use an image I took in the Louvre and wanted me to sign a different license. I refused as their license required I indemnify them and I had no idea what the legality of that image is given it was taken inside the Louvre