There are few best lenses for Canon EOS 5DS and EOS 5DS R which is mentioned below:
The first one in list is EF 50mm f/1.2L USM which is considered to the best portrait lens. This lens is specially designed for night photography, landscape scenery, wedding and so on. This lens is suitable for those who are unaware about photography and this lens helps to deliver stunning quality images. This is considered as L series lens.
The next one in the list is EF 85mm f/1.2L II USM is also one of the best portrait lens with more focal length. You can use this lens during low light, landscape, and portraits and so on. With little effort this lens helps you to capture great pictures of family and relatives. This is one time investment so you should at least try this lens for once in your life time.
The third one in the list is EF 24-70mm f/2.8L II USM is known for the best event shooting lens. This lens is considered to be the all rounder lens and it is used for portrait work, newborn and children. You can use this lens in low density light which means it will function in night and wedding and thus it helps to deliver quality images. Being a photographer you should carry this lens everyday.
The best lens for sports and wildlife photographers is EF 70-200mm f/2.8L IS II USM. This lens is used widely for shooting outdoor and indoor, travel, portraits and others. This lens delivers sharp and high quality images. This lens is slightly heavier and expensive than other lens but all the above it is fabulous. We recommend you to purchase this lens for its sharpness and low light performance.
In this list there is also one lens named as EF 100-400mm f/4.5-5.6L IS II USM is considered to be the best telephoto zoom lens. This lens is specially designed to capture wildlife and sports sharp images. This lens is fast and IS is very effective. This lens delivers sharp and great image stabilization at aperture f/5.6.
EF 600mm f/4L IS II USM is one of the best prime zoom lens for shooting wildlife and sports. This is basically designed for wildlife photos, landscape and so on. This lens is little bit heavy becomes one of the demerits mentioned. The overall specification of lens is quite excellent and this will deliver the sharp images and fast to focus and give incredible detail and color rendition.
The best lens for ultra wide shots is EF 14mm features aperture f/2.8 L II USM and is specially designed for landscape, night photography, weddings and so on. This lens is used for family or group gathering for pictures of room or building. This lens is really the expensive one but it retains quality even at the corners.
The last one in the list is EF 16-35mm f/2.8L II USM which is known for the best wide angle zoom lens for architecture and landscape photography. This is specially designed for night photography, weddings, and video and so on. All the above you can say this is all rounder lens and specially designed for capturing journalism photos. It is known for great glass and this will deliver sharp and fast image