In this video, I'll try to show you why using APS-C lenses on a Full Frame body not only might make sense, but it can also be a great way to achieve performance that'd be very hard to get otherwise.
I used a Sony a7rii and the following APS-C lenses: Rokinon 12mm f/2, Sigma 16mm f/1.4, Sigma 30mm f/1.4, Sigma 56mm f/1.4, Sony Zeiss 16-70mm f/4, Sony 70-350mm f/4.5-6.3. Check out some of the examples in this gallery: