Can anyone describe the differences in rear-seat legroom between the A/S/RS5 SB vs C7 A/S/RS7?

I know there are published numbers, but they often leave a lot to be desired when it comes to actual space. Just curious if anyone has sat in the rear seats of both and compared?

Thanks.

Iím seriously contemplating the RS5 SB come lease end if the new S7 comes with the same engine.