What are the requirements of professional photographers for camera performance?

For still life advertisements, high-quality portraits, landscapes and professional architectural photography, a landline (large-format camera) is usually used. In China, brands such as Shanna, Knight, Jinbao and Lin Hafu are widely used. Shooting clothing portraits, professional advertisements, etc. The demanding camera is often 120 (medium format camera). Hasselblad is the best digital camera at present, and it also has a film body and a digital back. Fashion advertising, civil business (photo studio, etc. ), news, sports and so on. Usually use 135 camera, which is also the most talked about by ordinary film friends, and Nikon Hejia can use it the most. I think Canon's 5D is a good machine.