Canon 5DS R has a Canon EF lens mount and currently there are 250 native lenses available for this mount.
Canon 5DS R doesn't have a sensor based image stabilization system but 76 of these lenses already comes with optical image stabilization.
Since Canon 5DS R has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on 5DS R.
You may also also be interested in these:
Canon 5DS R Lenses with Image Stabilization
Canon 5DS R Lenses with Weather Sealings